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

This reverts commit c92f4a5edd.

frontend/node_modules/yaml/dist/schema/common/seq.js

@@ -0,0 +1,19 @@
+'use strict';
+
+var identity = require('../../nodes/identity.js');
+var YAMLSeq = require('../../nodes/YAMLSeq.js');
+
+const seq = {
+    collection: 'seq',
+    default: true,
+    nodeClass: YAMLSeq.YAMLSeq,
+    tag: 'tag:yaml.org,2002:seq',
+    resolve(seq, onError) {
+        if (!identity.isSeq(seq))
+            onError('Expected a sequence for this tag');
+        return seq;
+    },
+    createNode: (schema, obj, ctx) => YAMLSeq.YAMLSeq.from(schema, obj, ctx)
+};
+
+exports.seq = seq;