Move ADRs to documentation site

[mimiflynn]

This migration required a format change to .mdx and now includes additional metadata. Happy to discuss.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.3%. Comparing base (d992c7d) to head (97b6b26).
Report is 17 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1001     +/-   ##
=======================================
- Coverage   67.3%   67.3%   -0.1%     
=======================================
  Files        311     311             
  Lines       9198    9198             
  Branches     966    1002     +36     
=======================================
- Hits        6199    6197      -2     
- Misses      2768    2771      +3     
+ Partials     231     230      -1     

see 5 files with indirect coverage changes

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[phn-ms]

The paths in the .sln files have been fixed.