Test docs

[raseidi]

• using sphinx autoapi only
• migrating to nbsphinx

[codecov]

Codecov Report

❌ Patch coverage is 99.01961% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 91.00%. Comparing base (eb683f3) to head (6508dc8).
⚠️ Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
src/skpm/base.py	94.73%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #45      +/-   ##
==========================================
+ Coverage   90.79%   91.00%   +0.21%     
==========================================
  Files          28       28              
  Lines         804      834      +30     
==========================================
+ Hits          730      759      +29     
- Misses         74       75       +1     

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

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.