docs: Draft compiler development guide

[mark-koch]

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 92.06%. Comparing base (c142cc4) to head (cee7dd3). Report is 159 commits behind head on main.

Files with missing lines	Patch %	Lines
docs/conf.py	0.00%	2 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #634      +/-   ##
==========================================
+ Coverage   91.39%   92.06%   +0.67%     
==========================================
  Files          59       67       +8     
  Lines        6481     7538    +1057     
==========================================
+ Hits         5923     6940    +1017     
- Misses        558      598      +40     

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