Venue homepage: All submissions tap on venue homepage

[racheljsmart]

Let me know if this issue belongs in a different repository.

We discussed as a team that it makes sense to show the All Submissions tab on the venue homepage when all reviewers are readers of all papers, so they have a place to easily access all papers.

Example, https://openreview.net/group?id=supaerodatascience.github.io/SupaeroSDD/2023/Workshop

[melisabok]

We need to figure out a way to see the submission readers to decide if we want to show the "All Submissions" tab or not.