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

This reverts commit c92f4a5edd.

frontend/node_modules/react-dnd-html5-backend/src/utils/js_utils.ts

@@ -0,0 +1,30 @@
+// cheap lodash replacements
+
+export function memoize<T>(fn: () => T): () => T {
+	let result: T | null = null
+	const memoized = () => {
+		if (result == null) {
+			result = fn()
+		}
+		return result
+	}
+	return memoized
+}
+
+/**
+ * drop-in replacement for _.without
+ */
+export function without<T>(items: T[], item: T) {
+	return items.filter((i) => i !== item)
+}
+
+export function union<T extends string | number>(itemsA: T[], itemsB: T[]) {
+	const set = new Set<T>()
+	const insertItem = (item: T) => set.add(item)
+	itemsA.forEach(insertItem)
+	itemsB.forEach(insertItem)
+
+	const result: T[] = []
+	set.forEach((key) => result.push(key))
+	return result
+}