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ICU-21697 Convert ICU Site pages to markdown for Github Pages
ICU-22707 gennorm2 & C++ norm2impl support MaybeNo - .nrm formatVersion 5 - updated data format doc & design doc
ICU-23475 Move MessageFormat2 C++ test files
ICU-23425 Fix URLs not generating links
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-23425 More broken links, Jekyll bug
ICU-21310 replacement User Guide main index page