Mark redirecting instances as inacessible

Too many instances redirect to either non-functional or spam sites. The
new behavior is to only allow 200-300 responses to mark an instance as
accessible.

lib/farside/instances.ex

@@ -29,7 +29,7 @@ defmodule Farside.Instances do
         |> then(&elem(&1, 1))
         |> Map.get(:status_code)
         |> case do
-          n when n < 400 ->
+          n when n < 300 ->
             IO.puts("#{@debug_spacer}✓ [#{n}]")
             :good
 

services-full.json

@@ -178,7 +178,6 @@
       "https://twat.marsey.cat",
       "https://twitter.censors.us",
       "https://nitter.grimneko.de",
-      "https://twitter.076.ne.jp",
       "https://nitter.sethforprivacy.com",
       "https://nitter.bus-hit.me",
       "https://n.l5.ca",

services.json

@@ -152,7 +152,6 @@
       "https://nitter.it",
       "https://twitter.censors.us",
       "https://nitter.grimneko.de",
-      "https://twitter.076.ne.jp",
       "https://nitter.sethforprivacy.com",
       "https://nitter.bus-hit.me",
       "https://n.l5.ca",