Add About page.

This adds the About page.  The formating is minimal.  Let me know what would be better.
I think this style doesn't apply because `.about` will apply to elements with `class="about"` instead of, as you have it, `id="about"`. To target that section, you should use `#about {`

(And a random web web developer protip, in general, CSS is global and so id and class names should be chosen so as to not collide with different parts of the site -- i.e. "about" is kind of vague and we might accidentally make another "about" section on the candidate page, or something, and then we would have this styling applying too)