Fix 7303 - remove unnessesary buttons on archived repos (#7326)

* archived repo - remove
- open/close button on issue list
- assigne person on issue list

Signed-off-by: Michael Gnehr <michael@gnehr.de>

* archived repo - remove
- comment field on issue view
- lock/unlock issue conversation button from sidebar on issue view

Signed-off-by: Michael Gnehr <michael@gnehr.de>

* archived repo - add 'compare commits' button to pull request

+ remove new pull request button from compare view

as the route is still working, and there is no need to be hidden

Signed-off-by: Michael Gnehr <michael@gnehr.de>

templates/repo/issue/view_content/sidebar.tmpl

@@ -336,7 +336,7 @@
 				{{end}}
 			</div>
 
-			{{ if .IsRepoAdmin }}
+			{{ if and .IsRepoAdmin (not .Repository.IsArchived) }}
 			<div class="ui divider"></div>
 			<div class="ui watching">
 				<div>