rename project from SimpleshopTheme to Berrypod

All modules, configs, paths, and references updated.
836 tests pass, zero warnings.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/berrypod_web/controllers/page_html.ex

@@ -0,0 +1,10 @@
+defmodule BerrypodWeb.PageHTML do
+  @moduledoc """
+  This module contains pages rendered by PageController.
+
+  See the `page_html` directory for all templates available.
+  """
+  use BerrypodWeb, :html
+
+  embed_templates "page_html/*"
+end