Switch to sqlite (#22)

* Updated project to use sqlite

* Edited migrations directly because I fear no man

* Updated search functions and tests to work with sqlite

* Updated build tools to remove postgres

lib/pinchflat/media/media_items_search_index.ex

@@ -0,0 +1,16 @@
+defmodule Pinchflat.Media.MediaItemSearchIndex do
+  @moduledoc """
+  The MediaItem fts5 search index. Not made to be directly interacted with,
+  but I figured it'd be better to have it in-app so it's not a mystery.
+  """
+
+  use Ecto.Schema
+
+  @primary_key {:id, :id, autogenerate: true, source: :rowid}
+  schema "media_items_search_index" do
+    field :title, :string
+    field :description, :string
+
+    field :rank, :float, virtual: true
+  end
+end