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

This reverts commit c92f4a5edd.

frontend/node_modules/preact/compat/server.js

@@ -0,0 +1,15 @@
+/* eslint-disable */
+var renderToString;
+try {
+	const mod = require('preact-render-to-string');
+	renderToString = mod.default || mod.renderToString || mod;
+} catch (e) {
+	throw Error(
+		'renderToString() error: missing "preact-render-to-string" dependency.'
+	);
+}
+
+module.exports = {
+	renderToString: renderToString,
+	renderToStaticMarkup: renderToString
+};