Revert "Add yet-another-react-lightbox package and update .gitignore to exclude node_modules"

This reverts commit c92f4a5edd.

frontend/node_modules/preact/test-utils/src/index.d.ts

@@ -0,0 +1,3 @@
+export function setupRerender(): () => void;
+export function act(callback: () => void | Promise<void>): Promise<void>;
+export function teardown(): void;