Build out the libraries section to be more like ruby-toolbox.com

[andrewhavens]

The original idea behind the "libraries" section is to be more like ruby-toolbox.com. There's a lot of work to be done there, but this GitHub issue is here for keeping track of what needs to be done.

[andrewhavens]

In fact, we should name this the Toolbox section so we can include non-library resources as well.