Remove submodule 'hooligan-solarized'.

It looks like ruhoh does not currently support the use of submodules, at least
not on ruhoh.com. Since a main reason I chose ruhoh is that it offers free
hosting, I will back off of this approach for now.
Manually clone working copy of 'hooligan-solarized' into 'themes'.

This approach will suffice until ruhoh gets support for submodules.
I will simply update this manually as I update hooligan-solarized.