cheatsheet: fold categories when searching

[shaunlebron]

I was searching for some, and didn't realize there were more sections below since I didn't see anything occupying the right half of the screen. Maybe we should use that space better by collapsing the sections into columns during filtering cases like this. (zoomed out below)

[oakmac]

This is a rehash of Issue #18

I agree the content should "fold" better.

[oakmac]

This feature gets a bit more difficult when you include the different layouts (right now 2 and 3 columns, I want to add a 4 column layout eventually). 1 column should be pretty simple.

Probably need to re-work how the markup and CSS is structured.