Update issue and PR templates

.github/ISSUE_TEMPLATE/fix-typo.yaml

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+name: Fix Typo or Error
+description: Fix typo(s) or error(s) in RDF and HTML documents
+title: "[FIX]: "
+labels: ["todo"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this report!
+  - type: checkboxes
+    id: specs
+    attributes:
+      label: Specs
+      description: Please indicate which specification is affected by this
+      options:
+        - label: DPV
+        - label: Personal Data (PD)
+        - label: Technical (TECH)
+        - label: Locations (LOC)
+        - label: RISK
+        - label: AI
+        - label: Justifications
+        - label: LEGAL (e.g. IE, US)
+        - label: EU-GDPR
+        - label: EU-DGA
+        - label: EU-NIS2
+        - label: EU-AIAct
+        - label: EU-Rights
+    validations:
+      required: true
+  - type: textarea
+    id: errors
+    attributes:
+      label: Errors
+      description: Please list all typo(s), error(s), etc. here
+      placeholder: Errors can be typo(s), missing or broken links, missing images, wrong references, incorrect attributions...
+      value: Fix ...
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/how-to-use.yaml

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+name: How to use DPV for...?
+description: Ask question(s) for how to use DPV for a specific application
+title: "[HOW]: "
+labels: ["todo"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to participate!
+  - type: checkboxes
+    id: specs
+    attributes:
+      label: Specs
+      description: Please indicate which specification the question is about
+      options:
+        - label: DPV
+        - label: Personal Data (PD)
+        - label: Technical (TECH)
+        - label: Locations (LOC)
+        - label: RISK
+        - label: AI
+        - label: Justifications
+        - label: LEGAL (e.g. IE, US)
+        - label: EU-GDPR
+        - label: EU-DGA
+        - label: EU-NIS2
+        - label: EU-AIAct
+        - label: EU-Rights
+    validations:
+      required: true
+  - type: textarea
+    id: question
+    attributes:
+      label: Question
+      description: What is the question or suggestion?
+      value: ...
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/suggest-concept.yaml

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+name: Suggest New or Change Existing Concept(s)
+description: Suggest new concept(s) or change existing concept(s)
+title: "[Concept]: "
+labels: ["todo"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out to participate!
+  - type: checkboxes
+    id: specs
+    attributes:
+      label: Specs
+      description: Please indicate which specification is affected by this
+      options:
+        - label: DPV
+        - label: Personal Data (PD)
+        - label: Technical (TECH)
+        - label: Locations (LOC)
+        - label: RISK
+        - label: AI
+        - label: Justifications
+        - label: LEGAL (e.g. IE, US)
+        - label: EU-GDPR
+        - label: EU-DGA
+        - label: EU-NIS2
+        - label: EU-AIAct
+        - label: EU-Rights
+    validations:
+      required: true
+  - type: textarea
+    id: new
+    attributes:
+      label: New Concept(s)
+      description: Please list all proposed new concept(s) here using the following structure
+      value: |
+        Term: e.g. NewConcept
+        Label: e.g. New Concept
+        Definition: e.g. this concept represents new concept
+        Parent term: e.g. Parent Cocept
+        Source: e.g. https://example.com or ISO-XYZ
+        Usage note: e.g. this concept should be used with specific consideration
+    validations:
+      required: false
+  - type: textarea
+    id: change
+    attributes:
+      label: Changed Concept(s)
+      description: Please list all proposed changes to existing concept(s) here using the following structure
+      value: |
+        Existing Term: e.g. dpv:NewConcept or risk:NewConcept
+        Change: e.g. change label from X to Y, or add usage note stating "xyz"
+        Justification: optional comment for why the change should be made
+    validations:
+      required: false

.github/pull_request_template.md

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+# Pull Request
+
+> **Important Note**: If your PR only includes commits to the RDF and HTML files directly - it will not be accepted. DPV's documentation generation happens via a workflow consisting of managing spreadsheets used for discussions, which are then used to generate the RDF and HTML. A PR adding/fixing something only in the 'output' will not be in snyc with the 'input'. Instead, please [open a new issue](https://github.com/w3c/dpv/issues/new) with the suggested changes. Attribution will be provided in commits for such changes e.g. Authored-by or Co-authored-by "Person". In case of questions, please [reach out to the maintainer](me@harshp.com) on how to best proceed.