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

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

@@ -1,19 +0,0 @@
-'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;