We have to define this one in helpers.css because tailwind only
generates a single class but certain things rely on this being
double-class. Command ran:
```sh
perl -p -i -e 's#gt-hidden#tw-hidden#g' web_src/js/**/* templates/**/* models/**/* web_src/css/**/*
---------
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
(cherry picked from commit ec3d467f15a683b305ac165c3eba6683628dcb25)
Conflicts:
templates/install.tmpl
templates/repo/diff/conversation.tmpl
templates/repo/issue/view_content/conversation.tmpl
templates/repo/issue/view_content/sidebar.tmpl
templates/repo/issue/view_title.tmpl
resolved by prefering Forgejo version and applying the
commands to all files
5016bc5d5c