Admin page to manage federation (or MRF policy in general)

[null2264]

Currently, federation can be managed from instance timeline, would be more convenience to also have it on Dashboard page

Page Path: Dashboard > Federation Config

Reference:

• Config (config.exs)

config :pleroma, :mrf,
  policies: [Pleroma.Web.ActivityPub.MRF.SimplePolicy]

config :pleroma, :mrf_simple,
  media_removal: [{"illegalporn.biz", "Media can contain illegal contant"}],
  media_nsfw: [{"porn.biz", "unmarked nsfw media"}, {"porn.business", "A lot of unmarked nsfw media"}],
  reject: [{"spam.com", "They keep spamming our users"}],
  federated_timeline_removal: [{"spam.university", "Annoying low-quality posts who otherwise fill up TWKN"}],
  report_removal: [{"whiny.whiner", "Keep spamming us with irrelevant reports"}]

• API endpoint: /api/v1/pleroma/admin/config