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

This reverts commit c92f4a5edd.

frontend/node_modules/jquery/src/selector/contains.js

@@ -0,0 +1,21 @@
+define( [
+	"../core"
+], function( jQuery ) {
+
+"use strict";
+
+// Note: an element does not contain itself
+jQuery.contains = function( a, b ) {
+	var bup = b && b.parentNode;
+
+	return a === bup || !!( bup && bup.nodeType === 1 && (
+
+		// Support: IE 9 - 11+
+		// IE doesn't have `contains` on SVG.
+		a.contains ?
+			a.contains( bup ) :
+			a.compareDocumentPosition && a.compareDocumentPosition( bup ) & 16
+	) );
+};
+
+} );