Discourse Category are closed

[couci]

Goal:

Discourse categories are closed and no longer used

Required:

• [x] Add on the announcement that Reps is no longer an active program (owner @couci @plwt )
• [x] Add banner on the subcategories that the program is no longer working (owner @couci )

[plwt]

I am not sure I have the access to do this. All I think that needs to happen is to have this thread pinned - https://discourse.mozilla.org/t/important-announcement-decommissioning-of-the-mozilla-reps-program/122291/

[couci]

pinned category and change the post rights to only admin