Remove `@*@*` from default allowlist

[fauno]

The CMS will auto-approve follows but moderates other activities.

• [ ] Remove @*@* from general allowlist
• [ ] Add @*@* to announcements
• [ ] Add @*@* to sites not managed by the CMS

[fauno]

Related to hyphacoop/distributed-press-organizing#153

[fauno]

@RangerMauve also gardenfence is not required by default on sutty-managed websites, could you remove it too?

[RangerMauve]

Mind opening a separate issue for the gardenfence stuff?

The allow all rule has been removed