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

frontend/node_modules/preact/src/util.js

@@ -1,27 +0,0 @@
-import { EMPTY_ARR } from "./constants";
-
-/**
- * Assign properties from `props` to `obj`
- * @template O, P The obj and props types
- * @param {O} obj The object to copy properties to
- * @param {P} props The object to copy properties from
- * @returns {O & P}
- */
-export function assign(obj, props) {
-	// @ts-ignore We change the type of `obj` to be `O & P`
-	for (let i in props) obj[i] = props[i];
-	return /** @type {O & P} */ (obj);
-}
-
-/**
- * Remove a child node from its parent if attached. This is a workaround for
- * IE11 which doesn't support `Element.prototype.remove()`. Using this function
- * is smaller than including a dedicated polyfill.
- * @param {Node} node The node to remove
- */
-export function removeNode(node) {
-	let parentNode = node.parentNode;
-	if (parentNode) parentNode.removeChild(node);
-}
-
-export const slice = EMPTY_ARR.slice;