Use instances table instead of Cachex

priv/repo/migrations/20200707112859_instances_add_favicon.exs

@@ -0,0 +1,10 @@
+defmodule Pleroma.Repo.Migrations.InstancesAddFavicon do
+  use Ecto.Migration
+
+  def change do
+    alter table(:instances) do
+      add(:favicon, :string)
+      add(:favicon_updated_at, :naive_datetime)
+    end
+  end
+end