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

frontend/node_modules/eslint/lib/cli-engine/formatters/json-with-metadata.js

@@ -1,16 +0,0 @@
-/**
- * @fileoverview JSON reporter, including rules metadata
- * @author Chris Meyer
- */
-"use strict";
-
-//------------------------------------------------------------------------------
-// Public Interface
-//------------------------------------------------------------------------------
-
-module.exports = function(results, data) {
-    return JSON.stringify({
-        results,
-        metadata: data
-    });
-};