Adding Region matrix

I've added a matrix that indicates what regions are supported for various cloud services. I'm blocked on two items, though, which I need help with:

- [ ] Visiting `/regions` returns a 404, but visiting `/regions/index.html` works (I think there's some kind of redirection going on).
- [ ] Right now, CSS is plonked at the top of the HTML file in its own `<style>` tags - I couldn't get the LESS file to be included for this new Jekyll page