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

frontend/node_modules/flatpickr/dist/esm/utils/polyfills.js

@@ -1,22 +0,0 @@
-"use strict";
-if (typeof Object.assign !== "function") {
-    Object.assign = function (target) {
-        var args = [];
-        for (var _i = 1; _i < arguments.length; _i++) {
-            args[_i - 1] = arguments[_i];
-        }
-        if (!target) {
-            throw TypeError("Cannot convert undefined or null to object");
-        }
-        var _loop_1 = function (source) {
-            if (source) {
-                Object.keys(source).forEach(function (key) { return (target[key] = source[key]); });
-            }
-        };
-        for (var _a = 0, args_1 = args; _a < args_1.length; _a++) {
-            var source = args_1[_a];
-            _loop_1(source);
-        }
-        return target;
-    };
-}