Add export records to CSV.
Add edit and delete record links to records index page.
Add edit links to users page. Admin can edit any user; non-admin can only self.
Send all users (including current) to users index view. Do not make link to delete current user.
Add controller action and policy to allow admin to delete users.
Factor record and user new/show forms into shared partials.
Implement updating of records.
Implement updating of users.
Clean up controllers.
Fix navbar to top of page.