Switch from recommonmark to myst

[iustin]

This addresses issue #43.

[codecov[bot]]

Codecov Report

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

Comparison is base (0d664a3) 78.91% compared to head (7150513) 78.91%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #44 +/- ## ======================================= Coverage 78.91% 78.91% ======================================= Files 1 1 Lines 479 479 Branches 78 78 ======================================= Hits 378 378 Misses 62 62 Partials 39 39 ```

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