Merge branch 'dev'

index.html

@@ -4,6 +4,7 @@
     <title>Gravity Simulator</title>
     <meta name="viewport" content="width=device-width" />
     <link rel="stylesheet" href="./style.css" />
+    <link rel="icon" href="./favicon.ico" />
   <script type="module">
     import { Sim } from './simulator.js';
     // Wait for document load

simulator.js

@@ -48,6 +48,11 @@ export class Sim {
     const div = document.getElementById(this.divId);
     this.div = div;
 
+    const url = new URL(window.location.href);
+    if (url.host === 'gravity.dev.laddhoffman.com') {
+      document.title += ' [Dev]';
+    }
+
     this.options = new Options(this, simOptions);
     this.display = new Display(this);
     this.system = new System(this);