Restructure documentation and document how to run tests locally

[tsalo]

Closes none.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 28.48%. Comparing base (dcb0f30) to head (35bf8aa).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #879 +/- ## ======================================= Coverage 28.48% 28.48% ======================================= Files 68 68 Lines 10152 10152 Branches 1146 1146 ======================================= Hits 2892 2892 Misses 7162 7162 Partials 98 98 ```

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[tsalo]

Thanks! I'll merge once CI passes.