Add template for admin page
Add empty moderator page
Fix username for admin, should be email address
Use new endpoint

The endoint that allows creating other users should be authenticated
Force /register to create commenters

/regiser is not gated to admins only, so it should be restricted
Start a repl with the ring server
Start using /admin/ for admin pages
Refactor admin pages and user creation

* We'll need to create users several different ways, so pull
that logic into shared functions.

* Add handler for /admin/register.  Currently this isn't working
right in the browser, but it does work from the repl.