Ordering/filtering workshops

[slef]

It would be useful to be able to reorder or filter the workshops list on
https://coauthor.csail.mit.edu/
and then to list them in that order in the dropdown.
Most useful would be sorting by workshop date (first post, last post)

As part of that we might want to have some info displayed by group

• First post date
• Last post date
• Last thread created date
• Number of threads
• Number of posts
• Number of members
• Admin(s)