docs(readme): update documentation badge link in README

[34j]

Description of change

Pull-Request Checklist

• Code is up-to-date with the main branch
• This pull request follows the contributing guidelines.
• This pull request links relevant issues as Fixes #0000
• There are new or updated unit tests validating the change
• Documentation has been updated to reflect this change
• The new commits follow conventions outlined in the conventional commit spec, such as "fix(api): prevent racing of requests".

• If pre-commit.ci is failing, try pre-commit run -a for further information.
• If CI / test is failing, try uv run pytest for further information.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 33.08%. Comparing base (d1f632b) to head (b25b231).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #281   +/-   ##
=======================================
  Coverage   33.08%   33.08%           
=======================================
  Files          11       11           
  Lines        6160     6160           
  Branches      891      891           
=======================================
  Hits         2038     2038           
  Misses       3772     3772           
  Partials      350      350           

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