Allow publishers to set a list of redirect rules for their publication.
Create a system that works similarly to Ghost's. Add a collectionredirects table:
When a page isn't found, look up the from fields and see if any match. If so, redirect by 301 or 302, depending on the permanent bool value.
Users should have a way to add redirects in the admin panel. To start, they'll get access to a JSON input field. To populate this field, we'll query collectionredirects and display the JSON. When saving this data, we'll parse the JSON and then update the database.