Adds markup and YAML fields for Implementation section.

Refs #13.
Compress outputs.
Adds page for Colophon. Refs #12.

Updates footer content and includes link to a colophon. Consider streamlining
this content a bit more.

Includes new layout for static pages that doesn't assume a fullscreen
background image.

Cleans up the styling for headings a bit, including a reduction in size for
the footer heading.
Float figures to right by default.

Fixes #10 by giving figures a default float so text content wraps
around them. Overrides float for larger figures.