Move ToC initialization code into own js file

layouts/partials/head.html

@@ -31,6 +31,7 @@
   <!-- JS -->
   <script src="https://cdnjs.cloudflare.com/ajax/libs/anchor-js/2.0.0/anchor.min.js"></script>
   <script src="js/toc.min.js"></script>
+  <script src="js/main.js"></script>
   {{ partial "analytics.html" . }}
 
   <!-- redirect from phil-opp.github.io/blog_os -->
@@ -38,28 +39,5 @@
     if (window.location.hostname == "phil-opp.github.io") {
       window.location.href = "http://os.phil-opp.com/";
     }
-
-    window.onload = function() {
-      var container = document.querySelector('#toc');
-
-      var selector = "h2";
-      if (container.className.split(" ").indexOf("coarse") == -1) {
-        selector += ",h3";
-      }
-
-      var toc = initTOC({
-          selector: selector,
-          scope: '.post',
-          overwrite: false,
-          prefix: 'toc'
-      });
-
-      var heading = document.createElement("H2");
-      var heading_text = document.createTextNode("Table of Contents");
-      heading.appendChild(heading_text);
-
-      container.appendChild(heading);
-      container.appendChild(toc);
-    }
   </script>
 </head>