By default force vertical tabs on mobile (#19486)

* By default force vertical tabs on mobile

- While experimenting with using vertical tabs instead of horizontal
tabs on gitea for a better mobile experience, I made a recent
PR(https://github.com/go-gitea/gitea/pull/19468) in order to see if
there was any objections to this new behavior for the repo headers(one
of the most annoying horizontal tabs). This PR had no objections and
even a user commenting that this change is brilliant.
- This PR now improves upon the previous PR by making this the de-facto
behavior for all menu's on mobile. The only exemption is the navbar
which also uses the menu but caught some layout errors with the changes.

* Fix organisation

* Fix repo/wiki buttons

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

templates/repo/header.tmpl

@@ -145,7 +145,7 @@
 		</div><!-- end grid -->
 	</div><!-- end container -->
 {{end}}
-	<div class="ui tabs container repo-header-container">
+	<div class="ui tabs container">
 		{{if not (or .Repository.IsBeingCreated .Repository.IsBroken)}}
 			<div class="ui tabular stackable menu navbar">
 				{{if .Permission.CanRead $.UnitTypeCode}}