Release rhino field

[adrianthedev]

Context

We have it up and running as a PoC on avodemo.

Checklist

Beta Give feedback

1. docs
2. authorization is not working and it's ok for now
3. it does not use the attachment_key option

Considerations

The attachments don't go through our own attachments route but through Rails'. This makes it difficult for us to authorize it.
Let's launch it like that and figure it out later.