On marketing site, disable course settings options that do not work.

When on the marketing site (edx.org) disable portions of the course settings page in Studio that do not actually work in that environment.
Don't concatenate together multiple strings.
pep8 fixes.
studio - revises markup/content for course about mgmt notices
studio - adds in basic rules for notices UI
studio - revises notice headings to use icons
Studio - adds minor UI/content changes to settings notices
studio - removes course settings promo link and notice icons
studio - revises styling of in-context notices UI
studio - unconditionalizes course summary info in settings
Merge branch 'master' into christina/course-settings-drupal
Modify after UX text changes.
Studio feature to disable course settings on Drupal site.
Merge pull request #210 from edx/christina/course-settings-drupal

On marketing site, disable course settings options that do not work.