Add game dev section!

Note: I blatantly did not test this >_>
This is unimplemented. Leftover copypasta from the two factor auth site we copied the styling/layout/jekyll template from. It used to be for the header of a per-category page for each of these types of companies. Now that we have more than one populated category, we could add this back in. Not strictly necessary, but maybe an issue we could make in the project. Thoughts?