Instructions for installing mobile apps

Replace the native js dialog with a page telling you how to
download the apps and how to set your HS URL.

src/vector/mobile_guide/index.js

@@ -0,0 +1,19 @@
+import {getVectorConfig} from '../getconfig';
+
+function onBackToRiotClick() {
+    document.cookie = 'mobile_redirect_to_guide=false;path=/';
+    window.location.href = '../';
+}
+
+async function initPage() {
+    document.getElementById('back_to_riot_button').onclick = onBackToRiotClick;
+
+    const config = await getVectorConfig('..');
+    let hsUrl = 'https://matrix.org/';
+    if (config && config['default_hs_url']) {
+        hsUrl = config['default_hs_url'];
+    }
+    document.getElementById('hs_url').innerHTML = hsUrl;
+}
+
+initPage();