Add scaling requirements to the deployment docs

[Christopher Allan Webber]

We should talk about what kind of server requirements you'll need
for about what size deployment somewhere in the deployment docs.

We don't really know yet and this is probably way down the road, so
marking this as low priority for now. But once we start doing
deployments, it should become higher in priority!

[Will Kahn-Greene]

This is probably something we want to do in the site administration
manual, though it might also live in the wiki in a draft form as we
figure things out.

Adding Sam to the watchers list.

Sam: How do you want to do this?

[Will Kahn-Greene]

The original url for this bug was ​http://bugs.foocorp.net/issues/288 .
Relations:
#50: related

[Christopher Allan Webber]

We currently have ​http://docs.mediagoblin.org/production-deployments.html which might not be perfect, but generally gives enough information where people have been able to start deploying things for a midsized install.

Could be better, but I think improvement should be in smaller tickets. Feel free to reopen and fill this with suggestions here, though.