Rebuild docsify and delete docs caching code

docs/lib/plugins/gitalk.js

@@ -0,0 +1,27 @@
+(function () {
+  /* eslint-disable no-unused-vars */
+  function install(hook) {
+    var dom = Docsify.dom;
+
+    hook.mounted(function (_) {
+      var div = dom.create('div');
+      div.id = 'gitalk-container';
+      var main = dom.getNode('#main');
+      div.style = "width: " + (main.clientWidth) + "px; margin: 0 auto 20px;";
+      dom.appendTo(dom.find('.content'), div);
+    });
+
+    hook.doneEach(function (_) {
+      var el = document.getElementById('gitalk-container');
+      while (el.hasChildNodes()) {
+        el.removeChild(el.firstChild);
+      }
+
+      // eslint-disable-next-line
+      gitalk.render('gitalk-container');
+    });
+  }
+
+  $docsify.plugins = [].concat(install, $docsify.plugins);
+
+}());