Remove fomantic transition module (#26469)

Removes all dropdown and dimmer animations. Works everywhere as far as I
can tell, but need to give this thorough testing. Removes around 70kb
JS/CSS.

Note, I'm not 100% sure regarding the various callbacks, those will need
more investigation, but it appears to work nonetheless.

Fixes: https://github.com/go-gitea/gitea/issues/15709

web_src/fomantic/semantic.json

@@ -43,7 +43,6 @@
     "site",
     "tab",
     "table",
-    "text",
-    "transition"
+    "text"
   ]
 }