release-78.2
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ICU-23055 Update outdated site.icu-project.org URLs.
ICU-23056 some ICU 78 download page updates
ICU-23056 Update documentation on BRS "Scrub issues"
ICU-23194 Add intersection and complement filters to Python data build tool
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-23055 add contacts page from ICU Site
ICU-21310 replacement User Guide main index page
ICU-22923 ICU 77 release page updates