Revert "build, doc: move to redesign"

[avivkeller]

This reverts commit 18a9ba5.

[nodejs-github-bot]

Review requested:

• @nodejs/actions
• @nodejs/web-infra

[bmuenzenmeyer]

closing in favor of #66573

[aduh95]

closing in favor of #66573

Note that #66573 is for v26.x, we still want to fix main at some point before 27.0.0-alpha.0.0.0, in three weeks

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.45%. Comparing base (a7e9f3b) to head (77c25de).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #66574      +/-   ##
==========================================
+ Coverage   90.43%   90.45%   +0.01%     
==========================================
  Files         791      791              
  Lines      276484   276484              
  Branches    53091    53103      +12     
==========================================
+ Hits       250047   250095      +48     
+ Misses      16844    16796      -48     
  Partials     9593     9593              

see 32 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.