Various changes and improvements.

Added warning message when console is opened, this is in preparation for alpha.
Added a new background image. Restored random backgrounds on launch (for now).
Changed the overlay dismiss/cancel buttons from anchors to buttons.

app/app.ejs

@@ -7,7 +7,7 @@
     <link type="text/css" rel="stylesheet" href="./assets/css/launcher.css">
     <style>
         body {
-            background: url('assets/images/backgrounds/<%=0%>.jpg') no-repeat center center fixed;
+            background: url('assets/images/backgrounds/<%=bkid%>.jpg') no-repeat center center fixed;
             background-size: cover;
         }
         #main {