docs: Convert docs to markdown

[AndreasAlbertQC]

Motivation

Markdown is easier to write than rst.

Changes

• Configured sphinx to parse markdown
• Changed existing docs to use markdown
• Added reference to relevant myst docs to the development section of the docs so that developers can read up on the syntax

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (545f177) to head (9206f42).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #170   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           51        50    -1     
  Lines         2913      2901   -12     
=========================================
- Hits          2913      2901   -12     

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