Add support for remote favicons

PleromaFE: pleroma-fe!1076 (merged)

config/config.exs

@@ -706,6 +706,8 @@
 
 config :ex_aws, http_client: Pleroma.HTTP.ExAws
 
+config :pleroma, :instances_favicons, enabled: false
+
 # Import environment specific config. This must remain at the bottom
 # of this file so it overrides the configuration defined above.
 import_config "#{Mix.env()}.exs"