Consistent formatting + TOC + A starter link

We don't have to use this style, but I think, before this gets out of hand, we should establish some style guidelines. I've opted to use the underline syntax for h1 + h2 to separate them from the super-specific h3+ tags and make smarter code editors auto-fold.

I've also added a link to Dmitriy Navrotskyy's front end dev repo, where there is a super abundance of this info.