feat: use changelog.rst instead of CHANGELOG.md for release notes

[klmcadams]

Use changelog.rst file to create a "Release notes" tab in the documentation instead of using CHANGELOG.md to record release notes

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 80.92%. Comparing base (02cf73d) to head (910d229).

:exclamation: Current head 910d229 differs from pull request most recent head 68068e2

Please upload reports for the commit 68068e2 to get more accurate results.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #757 +/- ## ========================================== - Coverage 81.73% 80.92% -0.81% ========================================== Files 32 32 Lines 1982 1982 ========================================== - Hits 1620 1604 -16 - Misses 362 378 +16 ```