Make admin panel live

[anishathalye]

Factoring out the "auto-reload" from issue #52

Currently, seeing updated data in the admin panel requires a manual reload of the page. It would be nice to make the admin panel live. A lazy way to do that would be to add a meta refresh, but that could be intrusive (it's bad if the page reloads while someone is in the middle of reading something / doing something). A better way to do that would probably be to fetch data using javascript and update the current page without reloading the whole thing.