Move static_fe config to its own section instead of in :instance.

config/config.exs

@@ -599,6 +599,8 @@ config :pleroma, Pleroma.ActivityExpiration, enabled: true
 
 config :pleroma, Pleroma.Plugs.RemoteIp, enabled: false
 
+config :pleroma, :static_fe, enabled: false
+
 config :pleroma, :web_cache_ttl,
   activity_pub: nil,
   activity_pub_question: 30_000

lib/pleroma/plugs/static_fe_plug.ex

@@ -18,7 +18,7 @@ defmodule Pleroma.Plugs.StaticFEPlug do
     end
   end
 
-  defp enabled?, do: Pleroma.Config.get([:instance, :static_fe], false)
+  defp enabled?, do: Pleroma.Config.get([:static_fe, :enabled], false)
 
   defp accepts_html?(conn) do
     conn |> get_req_header("accept") |> List.first() |> String.contains?("text/html")