Add some headings to repo views.

 * Add role heading level 1 to username/repo title.
 * Copy behaviour of Releases to some other views.

Author: fsologureng

templates/repo/header.tmpl

@@ -3,7 +3,7 @@
 	<div class="ui container">
 		<div class="repo-header">
 			<div class="repo-title-wrap df fc">
-				<div class="repo-title">
+				<div class="repo-title" role="heading" aria-level="1">
 					{{$avatar := (repoAvatar . 32 "mr-3")}}
 					{{if $avatar}}
 						{{$avatar}}

templates/repo/issue/navbar.tmpl

@@ -1,4 +1,4 @@
-<div class="ui compact left small menu">
+<h2 class="ui compact small menu header">
 	<a class="{{if .PageIsLabels}}active {{end}}item" href="{{.RepoLink}}/labels">{{.locale.Tr "repo.labels"}}</a>
 	<a class="{{if .PageIsMilestones}}active {{end}}item" href="{{.RepoLink}}/milestones">{{.locale.Tr "repo.milestones"}}</a>
-</div>
+</h2>