Update footer, CSS, and about page.

* I changed a little of the wording on the about page.
* I removed the links in the footer of each page and replaced them
  with a date of last update.
* I tweaked the CSS so the site title would be bigger and turn a
  different color when hovered.
Update CSS mode.

* Change main.css to non-executable.
Replace HTML pages with Jekyll project.

* Remove the HTML pages.
* Replace them with a Jekyll project that generates the exact same
  pages.
Merge branch 'r-0.2.0'