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

frontend/node_modules/preact/compat/src/Children.js

@@ -1,21 +0,0 @@
-import { toChildArray } from 'preact';
-
-const mapFn = (children, fn) => {
-	if (children == null) return null;
-	return toChildArray(toChildArray(children).map(fn));
-};
-
-// This API is completely unnecessary for Preact, so it's basically passthrough.
-export const Children = {
-	map: mapFn,
-	forEach: mapFn,
-	count(children) {
-		return children ? toChildArray(children).length : 0;
-	},
-	only(children) {
-		const normalized = toChildArray(children);
-		if (normalized.length !== 1) throw 'Children.only';
-		return normalized[0];
-	},
-	toArray: toChildArray
-};