Add cross-reference notes between CLI and Python API documentation

[simonw]

Take a look at the CLI documentation, and how it occasionally linked to the corresponding python feature - review if there are opportunities to add more links like that, and also to add reverse links back from Python to CLI

The CLI documentation had a handful of sections with notes linking to the
equivalent Python API feature. Extend that pattern to every CLI section
with a Python equivalent, and add matching 'In the CLI:' notes to the
Python API documentation linking back to the corresponding CLI command.

Co-Authored-By: Claude Fable 5 noreply@anthropic.com
Claude-Session: https://claude.ai/code/session_01WrZcTpmBvCq1HqPDweDjVT

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📚 Documentation preview 📚: https://sqlite-utils--791.org.readthedocs.build/en/791/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.55%. Comparing base (5e8822e) to head (f2b455e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #791   +/-   ##
=======================================
  Coverage   95.55%   95.55%           
=======================================
  Files           9        9           
  Lines        3798     3798           
=======================================
  Hits         3629     3629           
  Misses        169      169           

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