add Github link, update About section

lib/views/about.ejs

@@ -4,7 +4,6 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <link rel="stylesheet" type="text/css" href="/style.css?3">
-    <link rel="manifest" href="/manifest.json">
     <link rel="apple-touch-icon" sizes="180x180" href="/icon-180.png">
     <title>Facebook Events to iCal Converter | about</title>
   </head>
@@ -16,7 +15,10 @@
       Not too long ago I deactivated my Facebook account. While I do not miss the social network very much, plenty of local events are only announced on Facebook.
     </p>
     <p>
-      To my surprise, I found out that the company discontinued the ability to expor events to <em>iCal</em> files. This app aims at enabling you to do just that. <strong>It only works with public events</strong>. Unfortunately I haven't had the time to enable you to export your own events (but it's definitely possible).
+      To my surprise, I found out that the company discontinued the ability to export events to <em>iCal</em> files. This app aims at enabling you to do just that. <strong>It only works with public events</strong>. Unfortunately I haven't had the time to enable you to export your own events (but it's definitely possible).
+    </p>
+    <p>
+      I tried to keep the code and build as simple as I could. It does not have fancy build pipeline, code coverage or typing system, not even design (yeah you probably noticed that, right?)
     </p>
 
     <h3>How it works?</h3>
@@ -49,6 +51,6 @@
       If you want to let me know about any problems or improvements, you can contact me via my website, or even better create an issue on Github (link are on the main page in the footer).
     </p>
 
-    <a href="/">Go back</a>
+    <a href="#" onclick="window.open('', '_parent', '');window.close()">Close</a>
   </body>
 </html>