[BRANDING] Custom loading animation for Forgejo
(cherry picked from commit a3b3b8a2df)
(cherry picked from commit de0fd2d2e4)
(cherry picked from commit e1bf4de211)
(cherry picked from commit 60ffc88a47)
(cherry picked from commit 7d2beea9ca)
(cherry picked from commit 171eadb952)
(cherry picked from commit 5e81f75ed2)
Conflicts:
templates/install.tmpl
templates/post-install.tmpl
templates/repo/migrate/migrating.tmpl
(cherry picked from commit 641c4a36c5)
(cherry picked from commit f1dbb2dcff)
(cherry picked from commit b66de5e531)
(cherry picked from commit eeccdf21a1)
(cherry picked from commit af37663f4d)
(cherry picked from commit ed3739dccb)
(cherry picked from commit f0036e37cf)
(cherry picked from commit 90d453898a)
(cherry picked from commit c011543238)
(cherry picked from commit a294f34165)
(cherry picked from commit 6e1a1d188d)
(cherry picked from commit 20ae240edb)
(cherry picked from commit 164693cf14)
(cherry picked from commit 7c04fa1561)
(cherry picked from commit 7990fab6a9)
bbfe115a62