release-75-rc
ICU-21697 Convert ICU Site pages to markdown for Github Pages
ICU-22533 compact norm16 tables
ICU-22556 Prefer cc and c++ compilers
ICU-22534 BRS75 J Serialization test data
ICU-22533 Update badges for CI pipelines, user guide docs about CI
ICU-20088 User Guide migration: Add navigation structure and TOC for Jekyll, fix formatting issues, etc.
ICU-22194 Add CI job to generate Github Pages using Github Actions
ICU-21310 replacement User Guide main index page