Removes button style override.

Two commits here.

1. Replaces the empty table with a useful message when there are no categories

2. Removes the overriding of Bootstrap's button styling from the Rave brand file. The attempt to change the display was incomplete, and caused most Bootstrap components that involved the buttons to display pretty terribly. The changes were purely aesthetic in nature, but the consequences of the change are too great to justify, I think. If the buttons are to be made bigger, then the other components need to be made larger as well.

As a wise man once said,

![](https://i.imgflip.com/b5slp.jpg)