Support relative paths for index.html loads

Allows SUI to work at arbitrary path names rather than relying on fixed
root-level paths.

index.html

@@ -5,7 +5,7 @@
     <meta charset="utf-8">
     <meta http-equiv="Default-Style" content="">
     <meta content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no" name="viewport" />
-    <link type="text/css" rel="stylesheet" href="/assets/css/styles.css"  media="screen,projection"/>
+    <link type="text/css" rel="stylesheet" href="./assets/css/styles.css"  media="screen,projection"/>
     <link href="https://fonts.googleapis.com/css?family=Roboto:400,500,700,900" rel="stylesheet">
     <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
     <script src="https://cdnjs.cloudflare.com/ajax/libs/handlebars.js/4.1.1/handlebars.min.js"></script>
@@ -118,10 +118,10 @@
         </a>
     </div>
 
-    <script src="/assets/js/data.js" type="text/javascript"></script>
-    <script src="/assets/js/script.js" type="text/javascript"></script>
-    <script src="/assets/js/themer.js" type="text/javascript"></script>
-    <script src="/assets/js/search.js" type="text/javascript"></script>
+    <script src="./assets/js/data.js" type="text/javascript"></script>
+    <script src="./assets/js/script.js" type="text/javascript"></script>
+    <script src="./assets/js/themer.js" type="text/javascript"></script>
+    <script src="./assets/js/search.js" type="text/javascript"></script>
     
 </body>
-</html>
+</html>