Remove Docusaurus documentation site as it's been moved to the extras-docs repo

[kevin-lee]

Remove Docusaurus documentation site as it's been moved to the extras-docs repo

• Remove website directory and docs directory
• Remove docs and docsExtras* projects from build.sbt
• Remove doc-site-build-only.yml and doc-site-publish.yml workflows

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.66%. Comparing base (8ecdb32) to head (0349dba).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #604   +/-   ##
=======================================
  Coverage   89.66%   89.66%           
=======================================
  Files          46       46           
  Lines         726      726           
  Branches       46       46           
=======================================
  Hits          651      651           
  Misses         75       75           

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