[WIP] docs: constraints

[alexarice]

For some reason, something possessed me last friday to start writing documentation for constraints. This is how far I got. I would really like to finish and iterate these because the system seems like a common point of confusion, so I'm making a tracking PR to hold myself accountable.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.94%. Comparing base (a50e4ad) to head (8cd9027).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6278      +/-   ##
==========================================
- Coverage   86.94%   86.94%   -0.01%     
==========================================
  Files         431      431              
  Lines       64899    64898       -1     
  Branches     7420     7420              
==========================================
- Hits        56426    56425       -1     
  Misses       6901     6901              
  Partials     1572     1572              

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[superlopuh]

This is fantastic, but won't actually be displayed in the website as it is. Let's move it to either docs or the doc string for __init__.py in the folder?

[alexarice]

I feel it should be in docs rather than a doc string.

[superlopuh]

Either works for me, happy for it to be in docs. They're in a bit of a messy state right now so I think best thing to do would be to make a self-contained page and then we can put it in the right place later.