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/diff/compare.tmpl

@@ -56,9 +56,11 @@
         		{{.i18n.Tr "repo.pulls.has_pull_request" $.RepoLink $.RepoRelPath .PullRequest.Index | Safe}}
         	</div>
         {{else}}
+        	{{if not .Repository.IsArchived}}
         	<div class="ui info message show-form-container">
         		<button class="ui button green show-form">{{.i18n.Tr "repo.pulls.new"}}</button>
         	</div>
+        	{{end}}
         	<div class="pullrequest-form" style="display: none">
         		{{template "repo/issue/new_form" .}}
         	</div>