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

frontend/node_modules/yaml/dist/parse/cst-stringify.d.ts

@@ -1,8 +0,0 @@
-import type { CollectionItem, Token } from './cst';
-/**
- * Stringify a CST document, token, or collection item
- *
- * Fair warning: This applies no validation whatsoever, and
- * simply concatenates the sources in their logical order.
- */
-export declare const stringify: (cst: Token | CollectionItem) => string;