Create ChefWorker and move bake process into it

src/web/stylesheets/layout/_io.css

@@ -22,6 +22,8 @@
     background-color: transparent;
     white-space: pre-wrap;
     word-wrap: break-word;
+
+    transition: all 0.5s ease;
 }
 
 #output-html {
@@ -90,10 +92,10 @@
 
 @keyframes spinner {
     from {
-        transform:rotate(0deg);
+        transform: rotate(0deg);
     }
     to {
-        transform:rotate(359deg);
+        transform: rotate(359deg);
     }
 }