docs: basic architecture

[Rexbeast2]

fixes: #3220

[codecov-commenter]

Codecov Report

Merging #3240 (28e90a1) into main (8f10390) will decrease coverage by 5.40%.
Report is 10 commits behind head on main.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #3240      +/-   ##
==========================================
- Coverage   80.99%   75.59%   -5.40%     
==========================================
  Files         722      722              
  Lines       11209    11209              
  Branches     1502     1502              
==========================================
- Hits         9079     8474     -605     
- Misses       1726     2406     +680     
+ Partials      404      329      -75     

Flag	Coverage Δ
longtests	75.59% <ø> (-4.88%)	⬇️
win-longtests	?

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[terriko]

This looks good! I've got a minor nit about capital letters in the sources so they match. I'll just merge it before merging this, but it'll take a while because the tests will re-run.

[terriko]

Merge time!