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

frontend/node_modules/escape-string-regexp/index.js

@@ -1,13 +0,0 @@
-'use strict';
-
-module.exports = string => {
-	if (typeof string !== 'string') {
-		throw new TypeError('Expected a string');
-	}
-
-	// Escape characters with special meaning either inside or outside character sets.
-	// Use a simple backslash escape when it’s always valid, and a \unnnn escape when the simpler form would be disallowed by Unicode patterns’ stricter grammar.
-	return string
-		.replace(/[|\\{}()[\]^$+*?.]/g, '\\$&')
-		.replace(/-/g, '\\x2d');
-};