chore(site): fix path err (#745) (#749)

document/common/js/highlight.js

-import hljs from 'highlight.js/lib/highlight'
+import hljs from 'highlight.js/lib/core'
 
 import shell from 'highlight.js/lib/languages/shell'
 import css from 'highlight.js/lib/languages/css'

example/components/json-view.vue

@@ -8,7 +8,7 @@
 </template>
 
 <script type="text/ecmascript-6">
-  import hljs from 'highlight.js/lib/highlight'
+  import hljs from 'highlight.js/lib/core'
   import json from 'highlight.js/lib/languages/json'
   import 'highlight.js/styles/solarized-dark.css'
   hljs.registerLanguage('json', json)