Use mdformat for MD files

[jarrodmillman]

I want to manually update the RELEASE.md and see if we can incorporate the formatting in changelist before merging this.

Potential issues to consider:

• mdformat breaks Hugo shortcodes by escaping <
• the number can be configured
• the repo hasn't had much recent activity

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.33%. Comparing base (437e121) to head (f09ad13).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #113   +/-   ##
=======================================
  Coverage   95.33%   95.33%           
=======================================
  Files           5        5           
  Lines         236      236           
=======================================
  Hits          225      225           
  Misses         11       11           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.