Update README with relocation and gh-pages info

Updated project relocation information and gh-pages branch usage.
1 file changed
tree: a8ef3a49eee98fd189d86247d20c8463c3bdb79b
  1. README.md
README.md

This project has been relocated to grails-core as of Grails 7.

the gh-pages branch is used to redirect all https://gorm.grails.org/ URLs to https://grails.apache.org/docs-legacy-gorm