Add changelog to docs

[sloede]

Uses Changelog.jl to auto-generate PR links.

Docs preview: https://trixi-framework.github.io/Trixi.jl/previews/PR1933/changelog/

[github-actions]

Review checklist

This checklist is meant to assist creators of PRs (to let them know what reviewers will typically look for) and reviewers (to guide them in a structured review process). Items do not need to be checked explicitly for a PR to be eligible for merging.

Purpose and scope

• The PR has a single goal that is clear from the PR title and/or description.
• All code changes represent a single set of modifications that logically belong together.
• No more than 500 lines of code are changed or there is no obvious way to split the PR into multiple PRs.

Code quality

• The code can be understood easily.
• Newly introduced names for variables etc. are self-descriptive and consistent with existing naming conventions.
• There are no redundancies that can be removed by simple modularization/refactoring.
• There are no leftover debug statements or commented code sections.
• The code adheres to our conventions and style guide, and to the Julia guidelines.

Documentation

• New functions and types are documented with a docstring or top-level comment.
• Relevant publications are referenced in docstrings (see example for formatting).
• Inline comments are used to document longer or unusual code sections.
• Comments describe intent ("why?") and not just functionality ("what?").
• If the PR introduces a significant change or new feature, it is documented in NEWS.md.

Testing

• The PR passes all tests.
• New or modified lines of code are covered by tests.
• New or modified tests run in less then 10 seconds.

Performance

• There are no type instabilities or memory allocations in performance-critical parts.
• If the PR intent is to improve performance, before/after time measurements are posted in the PR.

Verification

• The correctness of the code was verified using appropriate tests.
• If new equations/methods are added, a convergence test has been run and the results
  are posted in the PR.

Created with ❤️ by the Trixi.jl community.

[ranocha]

Nice idea. Please find below two comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.10%. Comparing base (80f3c36) to head (a4d2185).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1933      +/-   ##
==========================================
+ Coverage   91.15%   96.10%   +4.95%     
==========================================
  Files         451      451              
  Lines       36410    36414       +4     
==========================================
+ Hits        33188    34993    +1805     
+ Misses       3222     1421    -1801     

Flag	Coverage Δ
unittests	96.10% <ø> (+4.95%)	⬆️

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[ranocha]

Thanks!