feat: add playwright and a11y audit and example test

test/unit/mv_web/controllers/page_controller_test.exs

@@ -0,0 +1,10 @@
+defmodule MvWeb.PageControllerTest do
+  use MvWeb.ConnCase
+
+  test "GET /", %{conn: conn} do
+    conn = conn_with_oidc_user(conn)
+
+    conn = get(conn, ~p"/")
+    assert html_response(conn, 200) =~ "Mitgliederverwaltung"
+  end
+end