feat: not allowed + not found pages

web/src/pages/NotAllowed/index.tsx

@@ -0,0 +1,7 @@
+import type { FC } from "react";
+
+const NotAllowedPage: FC = () => {
+  return <div>this resource is not allowed</div>;
+};
+
+export default NotAllowedPage;

web/src/pages/NotFound/index.tsx

@@ -0,0 +1,7 @@
+import type { FC } from "react";
+
+const NotFoundPage: FC = () => {
+  return <div>404 - Not Found</div>;
+};
+
+export default NotFoundPage;