docs: adjust intersphinx links & fix building docs with Python 3.14

[mr-c]

cherrypy indirection in no longer neeeded as of
cherrypy/cherrypy#1872 (comment)

sphinx-tabs is not yet compatible with docutils 0.22, so that is disallowed

❓ What kind of change does this PR introduce?

• 🐞 bug fix
• 🐣 feature
• 📋 docs update
• 📋 tests/coverage improvement
• 📋 refactoring
• 💥 other

📋 What is the related issue number (starting with #)

Resolves #

❓ What is the current behavior? (You can also link to an open issue here)

intersphinx inventory has moved: https://towncrier.rtfd.io/en/latest/objects.inv -> https://towncrier.readthedocs.io/en/latest/objects.inv
intersphinx inventory has moved: https://cherrypy.rtfd.io/en/latest -> https://docs.cherrypy.dev/en/latest/

❓ What is the new behavior (if this is a feature change)?
No warnings

📋 Other information:

📋 Contribution checklist:

(If you're a first-timer, check out
this guide on making great pull requests)

• I wrote descriptive pull request text above
• I think the code is well written
• I wrote good commit messages
• I have squashed related commits together after
  the changes have been approved
• Unit tests for the changes exist
• Integration tests for the changes exist (if applicable)
• I used the same coding conventions as the rest of the project
• The new code doesn't generate linter offenses
• Documentation reflects the changes
• The PR relates to only one subject with a clear title
  and description in grammatically correct, complete sentences

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.19%. Comparing base (662cd9d) to head (969fd35).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #811      +/-   ##
==========================================
- Coverage   78.38%   78.19%   -0.19%     
==========================================
  Files          41       41              
  Lines        4788     4788              
  Branches      547      547              
==========================================
- Hits         3753     3744       -9     
- Misses        896      905       +9     
  Partials      139      139              

[webknjaz]

See https://cheroot--811.org.readthedocs.build/en/811/history/#to-be-included-in-the-next-release for preview of the new change note in the context of the surrounding text.

[webknjaz]

Thanks for the PR! I may be slow to review (trying to limit my GH exposure due to health issues). But I think I've made the main notes I wanted to relay inline.

The linkcheck is broken due to tidelift moving the picture, it seems. So that's unrelated and shouldn't be fixed in this PR. I'll force-merge when needed.

[mr-c]

Thank for the review @webknjaz ; I've incorporated all of your suggestions and I think this PR is ready for merging.