Remove fomantic menu module (#30325)

A lot of variants are in use, so the diff stat isn't so great.

Co-authored-by: Giteabot <teabot@gitea.io>

web_src/css/index.css

@@ -11,6 +11,7 @@
 @import "./modules/list.css";
 @import "./modules/segment.css";
 @import "./modules/grid.css";
+@import "./modules/menu.css";
 @import "./modules/message.css";
 @import "./modules/table.css";
 @import "./modules/card.css";