Revamp:

- Switch from `cabal2nix` and haskell overlay to `developPackage`
- Restructure directories to have more descriptive names
- Fix `nix run`

www/js/script.js

@@ -0,0 +1,3 @@
+;(function(w, d) {
+  console.log('Hello, world!', w, d)
+})(window, document);

www/js/ui.js

@@ -0,0 +1,56 @@
+//  https://github.com/pure-css/pure/blob/master/site/static/js/ui.js
+
+(function (window, document) {
+
+    // we fetch the elements each time because docusaurus removes the previous
+    // element references on page navigation
+    function getElements() {
+        return {
+            layout: document.getElementById('layout'),
+            menu: document.getElementById('menu'),
+            menuLink: document.getElementById('menuLink')
+        };
+    }
+
+    function toggleClass(element, className) {
+        var classes = element.className.split(/\s+/);
+        var length = classes.length;
+        var i = 0;
+
+        for (; i < length; i++) {
+            if (classes[i] === className) {
+                classes.splice(i, 1);
+                break;
+            }
+        }
+        // The className is not found
+        if (length === classes.length) {
+            classes.push(className);
+        }
+
+        element.className = classes.join(' ');
+    }
+
+    function toggleAll() {
+        var active = 'active';
+        var elements = getElements();
+
+        toggleClass(elements.layout, active);
+        toggleClass(elements.menu, active);
+        toggleClass(elements.menuLink, active);
+    }
+    
+    function handleEvent(e) {
+        var elements = getElements();
+        
+        if (e.target.id === elements.menuLink.id) {
+            toggleAll();
+            e.preventDefault();
+        } else if (elements.menu.className.indexOf('active') !== -1) {
+            toggleAll();
+        }
+    }
+    
+    document.addEventListener('click', handleEvent);
+
+}(this, this.document));