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

frontend/node_modules/fast-json-stable-stringify/example/key_cmp.js

@@ -1,7 +0,0 @@
-var stringify = require('../');
-
-var obj = { c: 8, b: [{z:6,y:5,x:4},7], a: 3 };
-var s = stringify(obj, function (a, b) {
-    return a.key < b.key ? 1 : -1;
-});
-console.log(s);