Overview
Make it possible to turn off drafts for an instance.
Background
Some uses of WriteFreely don't require drafts and they end up getting in the way, so we should make it possible to turn them off.
Users
Admin
Implementation
Add a new config option under [app]: disable_drafts. If true, hide drafts from navigation menus.
Maybe still show drafts if a user has >0 drafts saved, so none are lost.