Make GitHub repo more obvious

Until I get a nice big GitHub button, pepper the copy with frequent
links to the repo

Author: csswizardry

demo/index.html

@@ -300,10 +300,12 @@ <h1>Obs.js: context-aware web performance for everyone</h1>
     })();
   </script>
 
-  <p>Obs.js is built and maintained by <a href=https://csswizardry.com>Harry
-    Roberts</a> under the MIT license.</p>
+  <p><a href=https://github.com/csswizardry/Obs.js>Obs.js</a> is built and
+  maintained by <a href=https://csswizardry.com>Harry Roberts</a> under the MIT
+  license.</p>
 
-  <p>This page shows the <code>.has-*</code> classes that Obs.js adds to the
+  <p>This page shows the <code>.has-*</code> classes that <a
+    href=https://github.com/csswizardry/Obs.js>Obs.js</a> adds to the
   <code>&lt;html&gt;</code> element, and the current <code>window.obs</code>
   object where it stores  device and network information.</p>
 
@@ -500,7 +502,8 @@ <h2><code>&lt;video&gt;</code> Demo</h2>
 
   <h2 id=showcase>Showcase</h2>
 
-  <p>These fine folk are using Obs.js:</p>
+  <p>These fine folk are using <a
+    href=https://github.com/csswizardry/Obs.js>Obs.js</a>:</p>
 
   <style>