Can't disable or delete old channels easily

[mlissner]

Two things here. First, the Mastodon Big Cases channel isn't enabled anymore, but I still see it when creating posts:

I'd expect that if a channel is disabled, it wouldn't show up in that page.

Second, I thought, fine, if I can't disable it, I know another way of getting rid of it. I'll just delete the channel. But when I tried to do that, it wanted to delete all of the posts:

So I think probably the fix is just to hide disabled channels from the front end, but maybe we should make them deletable too (though that'd require a null value for the FK in the post, I imagine, which perhaps we prefer not to have).

[mlissner]

I tried one other thing, removing myself as a curator of the mastodon channel. Buut, that didn't work either, I think because of the CDN. So perhaps that's another thing. Is the add-a-case page cached in the CDN? It probably doesn't need to be, particularly the HTML that it gets from the API.