Wrap files at <80 characters to resolve #17.

Hey there @kwalrath and @chalin, I've worked through all of the HTML files and done an overhaul of the HTML to standardize indentation and header/footer of each page, and wrap the lines at ~80 characters. This required quite a few judgment calls as far as where to break the line and how to indent, so feel free to let me know if something needs to be done a different way.