Number of fixes

- Saved some build time by running loop through current post’s category not all posts
- Better filtering for entries that could require code highlighting
- Grid visible by default
- Better watch options (less files watched)

Bookmarklet for grid
```
javascript:(function(){var grid=document.getElementById('grid');if(!grid){document.body.innerHTML+='<div id=grid><div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div></div></div>'}})();
```