Add a few diffusion-focused fedi instances

[Packbat]

I'd like to

• add
• remove
  these domain(s) or URL(s) to the diffusion output list.

Criteria:

• This site includes diffusion output on a public-facing page.
• These images hypothetically replace human artworks. (That is, they are not
  examples of diffusion output for the purpose of technical discussion.)

If either criterion are not fulfilled, your domain(s) or URL(s) cannot be on the
list.

Please describe below why these criteria are or are not fulfilled.

Adding some fedi instances we know about. Each of these have either admins who post diffusion art or are specifically for diffusion art.