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

frontend/node_modules/jquery/src/css/var/isHiddenWithinTree.js

@@ -1,34 +0,0 @@
-define( [
-	"../../core",
-	"../../core/isAttached"
-
-	// css is assumed
-], function( jQuery, isAttached ) {
-	"use strict";
-
-	// isHiddenWithinTree reports if an element has a non-"none" display style (inline and/or
-	// through the CSS cascade), which is useful in deciding whether or not to make it visible.
-	// It differs from the :hidden selector (jQuery.expr.pseudos.hidden) in two important ways:
-	// * A hidden ancestor does not force an element to be classified as hidden.
-	// * Being disconnected from the document does not force an element to be classified as hidden.
-	// These differences improve the behavior of .toggle() et al. when applied to elements that are
-	// detached or contained within hidden ancestors (gh-2404, gh-2863).
-	return function( elem, el ) {
-
-		// isHiddenWithinTree might be called from jQuery#filter function;
-		// in that case, element will be second argument
-		elem = el || elem;
-
-		// Inline style trumps all
-		return elem.style.display === "none" ||
-			elem.style.display === "" &&
-
-			// Otherwise, check computed style
-			// Support: Firefox <=43 - 45
-			// Disconnected elements can have computed display: none, so first confirm that elem is
-			// in the document.
-			isAttached( elem ) &&
-
-			jQuery.css( elem, "display" ) === "none";
-	};
-} );