Config Enhancements: Basic Theming Variables

[cycomachead]

Is your feature request related to a problem? Please describe.
We should have a section to control a limited site of theme options, without requiring too much CSS re-writing or hacking.

Describe the solution you'd like

theme_options:
  serif_headers: true|false
  course_logo_in_header: path/to/image

Describe alternatives you've considered
Making some better looking design choices.

Additional context
Add any other context or screenshots about the feature request here.