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

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

@@ -1,17 +0,0 @@
-'use strict';
-
-var Scalar = require('../../nodes/Scalar.js');
-
-const nullTag = {
-    identify: value => value == null,
-    createNode: () => new Scalar.Scalar(null),
-    default: true,
-    tag: 'tag:yaml.org,2002:null',
-    test: /^(?:~|[Nn]ull|NULL)?$/,
-    resolve: () => new Scalar.Scalar(null),
-    stringify: ({ source }, ctx) => typeof source === 'string' && nullTag.test.test(source)
-        ? source
-        : ctx.options.nullStr
-};
-
-exports.nullTag = nullTag;