templates: make dropdowns menus work when JavaScript is disabled (#4780)

* Make dropdowns menus work when JavaScript is disabled

* Update head.tmpl

* Update head.tmpl

templates/base/head.tmpl

@@ -90,6 +90,12 @@
 	<!-- Stylesheet -->
 	<link rel="stylesheet" href="{{AppSubURL}}/css/semantic-2.3.1.min.css">
 	<link rel="stylesheet" href="{{AppSubURL}}/css/gogs.css?v={{MD5 AppVer}}">
+	<noscript>
+		<style>
+			.dropdown:hover > .menu { display: block; }
+			.ui.secondary.menu .dropdown.item > .menu { margin-top: 0; }
+		 </style>
+	</noscript>
 
 	<!-- JavaScript -->
 	<script src="{{AppSubURL}}/js/semantic-2.3.1.min.js"></script>