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

mix.exs

@@ -35,7 +35,7 @@ defmodule Pinchflat.MixProject do
       {:phoenix, "~> 1.7.10"},
       {:phoenix_ecto, "~> 4.4"},
       {:ecto_sql, "~> 3.10"},
-      {:postgrex, ">= 0.0.0"},
+      {:ecto_sqlite3, ">= 0.0.0"},
       {:phoenix_html, "~> 3.3"},
       {:phoenix_live_reload, "~> 1.2", only: :dev},
       {:phoenix_live_view, "~> 0.20.1"},