refs #582 - Updated URL and template structure

I updated the URL and template structure for consistency and to better match how the app is being used today.

I made some other changes along the way, including:

- Removed `clear_form.js`, as it did not appear to be needed by any of our current forms
- Created a `get_active_entry` utility method
- Changed references to "People" to "Users" as this better describes the data model the site uses