Add how to guide section

[ChristopherGS]

Inspired by: https://fastapi.tiangolo.com/how-to/general/

https://linear.app/pydantic/issue/PYD-1363/create-index-or-general-how-to-guide-page

[hyperlint-ai]

The style guide flagged several spelling errors that seemed like false positives. We skipped posting inline suggestions for the following words:

• pytest

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (72ceb6b) to head (fd10dba).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #618   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          133       133           
  Lines        10567     10567           
  Branches      1450      1450           
=========================================
  Hits         10567     10567           

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[Kludex]

That's a thing I don't like about our docs and FastAPI ones: pages describing what you have in other pages.

It adds a lot of burden, since we forget about those pages.

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[ChristopherGS]

That's a thing I don't like about our docs and FastAPI ones: pages describing what you have in other pages.

It adds a lot of burden, since we forget about those pages.

As discussed, this is based on analysis of a lot of customer queries in the public slack, where people have struggled to find things in the docs. I agree that it does add some maintenance burden, but I think the trade-off in usability will be worth it.