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

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

@@ -1,7 +0,0 @@
-var stringify = require('../');
-
-var obj = { d: 6, c: 5, b: [{z:3,y:2,x:1},9], a: 10 };
-var s = stringify(obj, function (a, b) {
-    return a.value < b.value ? 1 : -1;
-});
-console.log(s);