use prettify css from yarn

src/css/index.js

@@ -1,5 +1,5 @@
 import './lib/bootstrap-colorpicker.css';
-import './lib/prettify.css';
+import 'google-code-prettify/src/prettify.css';
 import 'bootstrap/less/bootstrap.less';
 import './lib/bootstrap-switch.css';
 import './lib/jquery.splitter.css';

src/css/lib/prettify.css

@@ -1,68 +0,0 @@
-/** @license
-========================================================================
-  StyleSheet for Google Code Prettify
-  Copyright (C) 2006 Google Inc.
- 
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
- 
-       http://www.apache.org/licenses/LICENSE-2.0
- 
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-*/
-
-/* SPAN elements with the classes below are added by prettyprint. */
-.pln { color: #000 }  /* plain text */
-
-@media screen {
-  .str { color: #080 }  /* string content */
-  .kwd { color: #008 }  /* a keyword */
-  .com { color: #800 }  /* a comment */
-  .typ { color: #606 }  /* a type name */
-  .lit { color: #066 }  /* a literal value */
-  /* punctuation, lisp open bracket, lisp close bracket */
-  .pun, .opn, .clo { color: #660 }
-  .tag { color: #008 }  /* a markup tag name */
-  .atn { color: #606 }  /* a markup attribute name */
-  .atv { color: #080 }  /* a markup attribute value */
-  .dec, .var { color: #606 }  /* a declaration; a variable name */
-  .fun { color: red }  /* a function name */
-}
-
-/* Use higher contrast and text-weight for printable form. */
-@media print, projection {
-  .str { color: #060 }
-  .kwd { color: #006; font-weight: bold }
-  .com { color: #600; font-style: italic }
-  .typ { color: #404; font-weight: bold }
-  .lit { color: #044 }
-  .pun, .opn, .clo { color: #440 }
-  .tag { color: #006; font-weight: bold }
-  .atn { color: #404 }
-  .atv { color: #060 }
-}
-
-/* Put a border around prettyprinted code snippets. */
-pre.prettyprint { padding: 2px; border: 1px solid #888 }
-
-/* Specify class=linenums on a pre to get line numbering */
-ol.linenums { margin-top: 0; margin-bottom: 0 } /* IE indents via margin-left */
-li.L0,
-li.L1,
-li.L2,
-li.L3,
-li.L5,
-li.L6,
-li.L7,
-li.L8 { list-style-type: none }
-/* Alternate shading for lines */
-li.L1,
-li.L3,
-li.L5,
-li.L7,
-li.L9 { background: #eee }