Removed auto-generated comments

CONTRIBUTING.md

@@ -48,21 +48,6 @@ If you then still feel the need to ask a question and need clarification, we rec
 
 We will then take care of the issue as soon as possible.
 
-<!--
-You might want to create a separate issue tag for questions and include it in this description. People should then tag their issues accordingly.
-
-Depending on how large the project is, you may want to outsource the questioning, e.g. to Stack Overflow or Gitter. You may add additional contact and information possibilities:
-- IRC
-- Slack
-- Gitter
-- Stack Overflow tag
-- Blog
-- FAQ
-- Roadmap
-- E-Mail List
-- Forum
--->
-
 ## I Want To Contribute
 
 > ### Legal Notice <!-- omit in toc -->
@@ -90,7 +75,6 @@ A good bug report shouldn't leave others needing to chase you up for more inform
 #### How Do I Submit a Good Bug Report?
 
 > You must never report security related issues, vulnerabilities or bugs including sensitive information to the issue tracker, or elsewhere in public. Instead sensitive bugs must be sent by email to <unified-planning-maintainers@googlegroups.com>.
-<!-- You may add a PGP key to allow the messages to be sent encrypted as well. -->
 
 We use GitHub issues to track bugs and errors. If you run into an issue with the project:
 
@@ -105,8 +89,6 @@ Once it's filed:
 - A team member will try to reproduce the issue with your provided steps. If there are no reproduction steps or no obvious way to reproduce the issue, the team will ask you for those steps and mark the issue as `needs-repro`. Bugs with the `needs-repro` tag will not be addressed until they are reproduced.
 - If the team is able to reproduce the issue, it will be marked `needs-fix`, as well as possibly other tags (such as `critical`), and the issue will be left to be [implemented by someone](#your-first-code-contribution).
 
-<!-- You might want to create an issue template for bugs and errors that can be used as a guide and that defines the structure of the information to be included. If you do so, reference it here in the description. -->
-
 
 ### Suggesting Enhancements
 
@@ -128,10 +110,8 @@ Enhancement suggestions are tracked as [GitHub issues](https://github.com/aiplan
 - Use a **clear and descriptive title** for the issue to identify the suggestion.
 - Provide a **step-by-step description of the suggested enhancement** in as many details as possible.
 - **Describe the current behavior** and **explain which behavior you expected to see instead** and why. At this point you can also tell which alternatives do not work for you.
-- You may want to **include screenshots and animated GIFs** which help you demonstrate the steps or point out the part which the suggestion is related to. You can use [this tool](https://www.cockos.com/licecap/) to record GIFs on macOS and Windows, and [this tool](https://github.com/colinkeenan/silentcast) or [this tool](https://github.com/GNOME/byzanz) on Linux. <!-- this should only be included if the project has a GUI -->
 - **Explain why this enhancement would be useful** to most Unified Planning Library users. You may also want to point out the other projects that solved it better and which could serve as inspiration.
 
-<!-- You might want to create an issue template for enhancement suggestions that can be used as a guide and that defines the structure of the information to be included. If you do so, reference it here in the description. -->
 
 ### Your First Code Contribution
 <!-- TODO