Minor performance fix with css load order

I'm currently looking at improving page load times for NodeBB. Chrome dev tools gave me the following:

```
Optimize the order of styles and scripts (3)
  The following external CSS files were included after an external JavaScript file in the document head. To ensure CSS files are downloaded in parallel, always include external CSS before external JavaScript.
    jquery-ui.css
  2 inline script blocks were found in the head between an external CSS file and another resource. To allow parallel downloading, move the inline script before the external CSS file, or after the next resource.
```

I simply moved the styles above the scripts, keeping the styles in order.