Hi there! There will be a page... in fact, I should probably start building that. I'll return with the link when it's ready.
The rules are pretty relaxed, the goal is to keep our projects going and continue to post and share progress! With that in mind, the main "rule" is to continue a MGGJ project from any of the jams (1-10) or alternately start a new project using one of the previous jams as the theme set. (I'll likely be continuing my MGGJ8 game, which has been waiting since last year)
There's a "continue-it-mggj" channel on the MGGJ discord where most of the updates/progress sharing/feedback will be posted, though you're free to use other channels too, like art-feedback, devlog, etc!