Docs: Update Bolt Python Assistant doc to match JS structure.

[technically-tracy]

Summary

Update Bolt Python Assistant doc to match JS structure.

Category

• slack_bolt.App and/or its core components
• slack_bolt.async_app.AsyncApp and/or its core components
• Adapters in slack_bolt.adapter
• Document pages under /docs
• Others

[seratch]

Thank you; this is great!

[WilliamBergamin]

Not sure whats going on with these tests 🤔 let me know if you would like some help with them, I don't think you changes have anything to do with this

[technically-tracy]

Not sure whats going on with these tests 🤔 let me know if you would like some help with them, I don't think you changes have anything to do with this

Yeah, I have no idea 😬 I tried to re-run them, but they're still failing.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.96%. Comparing base (276eae6) to head (c8cf99f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1239   +/-   ##
=======================================
  Coverage   90.96%   90.96%           
=======================================
  Files         222      222           
  Lines        7501     7501           
=======================================
  Hits         6823     6823           
  Misses        678      678           

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