[Submissions] Remove incorrect proofs information from author's view on submission
Currently, we do not have a functional system to upload the proofs to a submission's page and allow authors to download them (I believe this functionality was sketched but never finished). However, it seems authors are shown a Proofs section in their submision's page, that perpetually indicates "No proofs available" (see screenshot below sent by an author).
The Proofs section should be removed from view until it is functional.