Is your feature request related to a problem? Please describe.
As a Preprint Repository admin, I want to choose whether comments (including invited comments) should be enabled or disabled in my preprint server.

Describe the solution you'd like
A new section should be added to the Repository Wizard with a toggle box: Comments & Invited Reviewers.

If box is ticked, then comment workflow is enabled:

1. Comment boxes appear on preprint item pages
2. Manage Reviewers appears as an option/page for preprints moderators and admins
3. Manage Comments appears as an option for preprints moderators and admins

Describe alternatives you've considered
Toggle setting could instead be at Press level (managing settings for all repositories).

Additional context
Mockup: Repository wizard

Mockup: Preprints moderator dashboard

Mockup: Preprint item page (moderator view)

Mockup: Preprint item page (live item)