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

frontend/node_modules/yaml/browser/dist/compose/util-flow-indent-check.js

@@ -1,15 +0,0 @@
-import { containsNewline } from './util-contains-newline.js';
-
-function flowIndentCheck(indent, fc, onError) {
-    if (fc?.type === 'flow-collection') {
-        const end = fc.end[0];
-        if (end.indent === indent &&
-            (end.source === ']' || end.source === '}') &&
-            containsNewline(fc)) {
-            const msg = 'Flow end indicator should be more indented than parent';
-            onError(end, 'BAD_INDENT', msg, true);
-        }
-    }
-}
-
-export { flowIndentCheck };