Load treeview.js only on pages where it's needed

Close #148

Author: qzhou1607-zz

src/hexo/themes/documentation/layout/index.hbs

@@ -77,7 +77,9 @@
     <script src="{{url_for "js/nav.js "}}"></script>
     <script src="{{url_for "core/scripts/form-validation.js "}}"></script>
     <script src="{{url_for "components/accordion/accordion.js "}}"></script>
+    {{#compare page.category 'belongsTo' 'developer-guide, user-guide'}}
     <script src="{{url_for "components/treeview/treeview.js "}}"></script>
+    {{/compare}}
     {{>docsearch}}
     <script>(function(G,o,O,g,l){G.GoogleAnalyticsObject=O;G[O]||(G[O]=function(){(G[O].q=G[O].q||[]).push(arguments)});G[O].l=+new Date;g=o.createElement('script'),l=o.scripts[0];g.src='https://www.google-analytics.com/analytics.js';l.parentNode.insertBefore(g,l)}(this,document,'ga'));ga('create','{{ theme.google_analytics }}');ga('send','pageview')</script>
 </body>