Improvements for default template selection admin interface

[bree-z]

From #398

In CBOX OL Dashboard > Groups > Types after selecting a default site template, it may not be apparent that users have to scroll down to the bottom to click the 'Save' button.

We could think about how to improve the interface here. There are lots of possibilities:

• A Save control below each section
• A visual indicator (like a different color outline, or perhaps extra text in the accordion handle, near the word 'Courses') indicating "dirty" unsaved states
• Accordions/collapsibles for long subsections like 'Labels'