Static file mounting

This begins the adventure of both:

* Sticking nginx in a container
* Mounting static assets from the userland container to the nginx container

This also tosses the `static.tar` legacy file.
There's [a trick](https://github.com/rackerlabs/peril-encore/blob/master/deploy/roles/perilinside/tasks/main.yml#L5) you can do to register whether or not a newer image was actually pulled, which can save you extraneous restarts.