Include repo name in page title tag (#6343)

Fixes #6265

templates/base/head.tmpl

@@ -4,7 +4,7 @@
 	<meta charset="utf-8">
 	<meta name="viewport" content="width=device-width, initial-scale=1">
 	<meta http-equiv="x-ua-compatible" content="ie=edge">
-	<title>{{if .Title}}{{.Title}} - {{end}}{{AppName}}</title>
+	<title>{{if .Title}}{{.Title}} - {{end}} {{if .Repository.Name}}{{.Repository.Name}} - {{end}}{{AppName}}</title>
 	<link rel="manifest" href="{{AppSubUrl}}/manifest.json">
 
 	<script>