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

frontend/node_modules/ajv/lib/cache.js

@@ -1,26 +0,0 @@
-'use strict';
-
-
-var Cache = module.exports = function Cache() {
-  this._cache = {};
-};
-
-
-Cache.prototype.put = function Cache_put(key, value) {
-  this._cache[key] = value;
-};
-
-
-Cache.prototype.get = function Cache_get(key) {
-  return this._cache[key];
-};
-
-
-Cache.prototype.del = function Cache_del(key) {
-  delete this._cache[key];
-};
-
-
-Cache.prototype.clear = function Cache_clear() {
-  this._cache = {};
-};