* Build and publish v4 lib/ and themes/ folders for backwards compatibility while users transition to v5.
- add a script to build the legacy v4 lib/ and themes/ folders
- append deprecation console warnings to the v4 JS files during the v4 build
- add a script to clean v4 build outputs
- hook the v4 build/clean scripts into the release.sh script
- test the v4 build and clean in CI
* fix: update repository field format in package.json
---------
Co-authored-by: Luffy <52o@qq52o.cn>
BREAKING: SSR removed
Anyone depending on SSR will need to stay on an old Docsify version for
now, move forward without SSR, or maintain SSR against a fork of updated
Docsify. We have ideas on a better way to implement SSR, but these ideas
have not been implemented yet.
Luffy