webpack: Don't include katex bundle in base.html.

Since we use katex only in the main webapp, we don't need it in things
like landing page etc, so it is better to move it to index.html.

templates/zerver/base.html

@@ -28,7 +28,6 @@
         </script>
         {% endblock %}
         {{ render_bundle('common') }}
-        {{ render_bundle('katex') }}
         {% block customhead %}
         {% endblock %}
     </head>

templates/zerver/index.html

@@ -39,6 +39,8 @@ var page_params = {{ page_params }};
 
 {{ render_bundle('translations') }}
 
+{{ render_bundle('katex') }}
+
 {% include "zerver/topic_is_muted.html" %}
 
 {% endblock %}

tools/travis/success-http-headers.txt

@@ -22,10 +22,10 @@ Reusing existing connection to localhost:443.
   HTTP/1.1 200 OK
   Server: nginx/1.4.6 (Ubuntu)
   Content-Type: text/html; charset=utf-8
-  Content-Length: 6205
+  Content-Length: 6107
   Connection: keep-alive
   Strict-Transport-Security: max-age=15768000
-Length: 6205 (6.1K) [text/html]
+Length: 6107 (6.0K) [text/html]
 Saving to: ‘/tmp/index.html’