Look into migrating from Scrivener to Flop

Scrivener/Scrivener_Ecto are in low maintenance mode and no longer being updated/supported.

https://github.com/woylie/flop https://github.com/woylie/flop_phoenix

UPDATE

We have taken over maintenance of Scrivener and Scrivener.Ecto so this should be exploratory. If it makes sense to transition to Flop and keep Scrivener in low maintenance mode, we should look into it. Otherwise, we can/should do some updates on Scrivener and take it out of low maint mode.