Fix blank page on reload bug

Add `<base href="/" />` in index.html to fix 404 error when refreshing a
page with nested route.

GitLab: #86
Change-Id: Ic728e68f710c336cb3250a1f71cd8a3fba1bd6d0
diff --git a/client/index.html b/client/index.html
index f308177..3864345 100644
--- a/client/index.html
+++ b/client/index.html
@@ -6,6 +6,7 @@
     <meta name="viewport" content="minimum-scale=1, initial-scale=1, width=device-width" />
     <meta name="description" content="Jami Web" />
     <title>Jami Web</title>
+    <base href="/" />
   </head>
 
   <body>