Use RTD stable release, remove auto GH pre-release

[rly]

Motivation

• Fix [Bug]: RTD page was pointing to version from Oct 2023 #253.
• I updated the default RTD to point to "stable" instead of "latest", and I removed the "latest" version. I added an automation rule in RTD to activate the version associated with each tag. I activated versions for the last two tags. Now the possible versions are: "stable", "dev", 0.10.0, and 0.9.0.
• Also removed workflow that automatically generated GitHub pre-releases on each commit to dev to simplify maintenance.
• Also adopted changelog format conventions: https://keepachangelog.com/en/1.0.0/

Checklist

• Did you update CHANGELOG.md with your changes?
• Does the PR clearly describe the problem and the solution?
• Have you reviewed our Contributing Guide?
• Does the PR use "Fix #XXX" notation to tell GitHub to close the relevant issue numbered XXX when the PR is merged?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.60%. Comparing base (40d2ab7) to head (a366765).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #254   +/-   ##
=======================================
  Coverage   86.60%   86.60%           
=======================================
  Files           5        5           
  Lines        1209     1209           
  Branches      230      230           
=======================================
  Hits         1047     1047           
  Misses        103      103           
  Partials       59       59           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.