docs: Use GitHub Issue forms as Issue templates (#1576)

* Use GitHub Issue form Issue templates to provide more consistent context of requested information from users
   - c.f. 
https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/configuring-issue-templates-for-your-repository#creating-issue-forms
   - Remove all previous GitHub Issue templates
   - These Issue forms are heavily influenced / copied from Ansible's https://github.com/ansible/ansible/
   - Intentionally add a second space after emojis to have them render better on macOS
* Add config.yml to also link users to GitHub Discussions, the pyhf tutorial, and the Code of Conduct

Co-authored-by: Sviatoslav Sydorenko <wk.cvs.github@sydorenko.org.ua>

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -0,0 +1,148 @@
+---
+name: 🐛  Bug Report
+description: Create a report to help us improve
+labels: ["bug", "needs-triage"]
+
+body:
+- type: markdown
+  attributes:
+    value: >
+      **Thank you for wanting to report a bug in pyhf!**
+
+
+      ⚠
+      Verify first that your issue is not [already reported on
+      GitHub][issue search].
+
+
+      [issue search]: https://github.com/scikit-hep/pyhf/issues?q=is%3Aopen+is%3Aissue+label%3Abug
+
+- type: textarea
+  attributes:
+    label: Summary
+    description: Explain the problem briefly below.
+    placeholder: >-
+      When I try to do X with pyhf and the following workspace, Y breaks or
+      Z happens in an unexpected manner.
+      Here are all the details I know about this problem.
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: OS / Environment
+    description: >-
+      Provide information on your operating system.
+      Something like the output of `cat /etc/os-release` on Linux or
+      `system_profiler -detailLevel mini SPSoftwareDataType` on macOS.
+    render: console
+    placeholder: |
+      # Linux
+      $ cat /etc/os-release
+      NAME="Ubuntu"
+      VERSION="20.04.2 LTS (Focal Fossa)"
+      ID=ubuntu
+      ID_LIKE=debian
+      PRETTY_NAME="Ubuntu 20.04.2 LTS"
+      VERSION_ID="20.04"
+      HOME_URL="https://www.ubuntu.com/"
+      SUPPORT_URL="https://help.ubuntu.com/"
+      BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
+      PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
+      VERSION_CODENAME=focal
+      UBUNTU_CODENAME=focal
+
+      # macOS
+      $ system_profiler -detailLevel mini SPSoftwareDataType | head -n 6
+      Software:
+
+          System Software Overview:
+
+            System Version: macOS 10.15.7 (19H1323)
+            Kernel Version: Darwin 19.6.0
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Steps to Reproduce
+    description: >-
+      Describe exactly how to reproduce the problem, using a minimal test-case.
+      It would *really* help us understand your problem if you paste in the Python code
+      that you're running.
+
+
+      **HINT:** You can paste [GitHub Gist](https://gist.github.com) links for larger files.
+    value: |
+      <!--- Paste your minimal failing Python example code between the quotes below -->
+      ```python (paste below)
+
+      ```
+
+      <!--- ...or if you have a failing CLI command paste it between the quotes below -->
+      ```console (paste below)
+
+      ```
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: File Upload (optional)
+    description: >-
+      If your steps to reproduce your minimal failing example require either a spec or a
+      workspace file, please upload it by attaching it to the text area here.
+
+
+      **HINT:** You can paste [GitHub Gist](https://gist.github.com) links for larger files.
+    placeholder: >-
+      Attach any files or compressed archives by dragging & dropping, selecting,
+      or pasting them here.
+  validations:
+    required: false
+
+- type: textarea
+  attributes:
+    label: Expected Results
+    description: >-
+      Describe what you expected to happen when running the steps above.
+    placeholder: >-
+      I expected X to happen because I assumed Y.
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Actual Results
+    description: >-
+      Paste verbatim program or command output.
+      Don't wrap it with tripple backticks &mdash; your whole input will be
+      turned into a code snippet automatically.
+    render: console
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: pyhf Version
+    description: >-
+      Paste verbatim output from `pyhf --version` below, under the prompt line.
+      Don't wrap it with tripple backticks &mdash; your whole input will be
+      turned into a code snippet automatically.
+    render: console
+    placeholder: |
+      $ pyhf --version
+  validations:
+    required: true
+
+- type: checkboxes
+  attributes:
+    label: Code of Conduct
+    description: |
+      Read the [`pyhf` Code of Conduct][CoC] first.
+
+      [CoC]: https://github.com/scikit-hep/pyhf/blob/master/CODE_OF_CONDUCT.md
+    options:
+    - label: I agree to follow the Code of Conduct
+      required: true
+...

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,15 @@
+# Ref: https://help.github.com/en/github/building-a-strong-community/configuring-issue-templates-for-your-repository#configuring-the-template-chooser
+blank_issues_enabled: true
+contact_links:
+- name: 🙋  Useage Questions
+  url: https://github.com/scikit-hep/pyhf/discussions
+  about: |
+    Use pyhf's GitHub Discussions to ask "How do I do X with pyhf?".
+- name: 📖  Tutorial
+  url: https://pyhf.github.io/pyhf-tutorial/
+  about: |
+    The pyhf tutorial is continually updated and provides an in depth walkthrough
+    of how to use the latest release of pyhf.
+- name: 📝  pyhf Code of Conduct
+  url: https://github.com/scikit-hep/pyhf/blob/master/CODE_OF_CONDUCT.md
+  about: Expectations for how people will interact with each other on pyhf's GitHub.

.github/ISSUE_TEMPLATE/documentation-report.yml

@@ -0,0 +1,52 @@
+---
+name: 📝  Documentation Report
+description: Create a report for problems with the docs
+labels: ["docs", "needs-triage"]
+
+body:
+- type: markdown
+  attributes:
+    value: >
+      **Thank you for wanting to report a problem with pyhf's documentation!**
+
+
+      ⚠
+      Verify first that your issue is not [already reported on
+      GitHub][issue search].
+
+
+      [issue search]: https://github.com/scikit-hep/pyhf/issues?q=is%3Aopen+is%3Aissue+label%3Abug
+
+- type: textarea
+  attributes:
+    label: Summary
+    description: >-
+      Explain the problem briefly below, add suggestions to wording or structure.
+      If there are external references that are related please link them here
+      as well.
+    placeholder: >-
+      I was reading the pyhf documentation for pyhf version X and I'm having
+      problems understanding Y.
+      It would be very helpful if that got rephrased as Z.
+  validations:
+    required: true
+
+- type: input
+  attributes:
+    label: Documentation Page Link
+    description: |
+      Paste the link to the documentation webpage that you have a question on.
+  validations:
+    required: true
+
+- type: checkboxes
+  attributes:
+    label: Code of Conduct
+    description: |
+      Read the [`pyhf` Code of Conduct][CoC] first.
+
+      [CoC]: https://github.com/scikit-hep/pyhf/blob/master/CODE_OF_CONDUCT.md
+    options:
+    - label: I agree to follow the Code of Conduct
+      required: true
+...

.github/ISSUE_TEMPLATE/feature-request.yml

@@ -0,0 +1,80 @@
+---
+name: ✨  Feature Request
+description: Suggest an idea for this project
+labels: ["feat/enhancement ", "needs-triage"]
+
+body:
+- type: markdown
+  attributes:
+    value: >
+      **Thank you for wanting to suggest a feature for pyhf!**
+
+
+      ⚠
+      Verify first that your issue is not [already reported on
+      GitHub][issue search].
+      Make sure to check the closed issues as well as it may
+      already be implemented in a development release.
+
+
+      [issue search]: https://github.com/scikit-hep/pyhf/issues?q=is%3Aopen+is%3Aissue+label%3Abug
+
+
+- type: textarea
+  attributes:
+    label: Summary
+    description: >
+      Describe the new feature/improvement you would like briefly below.
+
+
+      What's the problem this feature will solve?
+      What are you trying to do, that you are unable to achieve
+      with the **latest** release of pyhf?
+
+
+      * Provide examples of real-world use cases that this would enable
+      and how it solves the problem you described.
+
+      * How do you solve this now?
+
+      * Have you tried to work around the problem?
+
+      * Could there be a different approach to solving this issue?
+
+
+      If there are external references or other GitHub Issues that are related
+      please link them here as well.
+    placeholder: >-
+      I am trying to do X with pyhf version x.y.z and I think that implementing
+      new feature Y would be very helpful for me and every other user because of Z.
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Additional Information
+    description: |
+      If you can, describe how the feature would be used in a mock code example.
+
+      **HINT:** You can paste [GitHub Gist](https://gist.github.com) links for larger files.
+    value: |
+      <!--- Describe what you are showing in your example -->
+
+      <!--- and then paste your mock Python example code between the quotes below -->
+      ```python (paste below)
+
+      ```
+  validations:
+    required: false
+
+- type: checkboxes
+  attributes:
+    label: Code of Conduct
+    description: |
+      Read the [`pyhf` Code of Conduct][CoC] first.
+
+      [CoC]: https://github.com/scikit-hep/pyhf/blob/master/CODE_OF_CONDUCT.md
+    options:
+    - label: I agree to follow the Code of Conduct
+      required: true
+...

.github/ISSUE_TEMPLATE/~release-checklist.md

@@ -1,5 +1,5 @@
 ---
-name: (Maintainers Only) Release Checklist
+name: ✅  Release Checklist (Maintainers Only)
 about: Checklist for core developers to complete as part of making a release
 
 ---