Various changes in order to make startup and error handling more robust.

html/offline.html

@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Offline</title>
+    <style>
+        html,
+        body {
+            width: 100%;
+            height: 100%;
+            margin: 0;
+            background: #000;
+        }
+    </style>
+</head>
+
+<body></body>
+
+</html>