docs: added doc pages for v1.20.4 (#6828)

- Added new documentation page for Medusa Worker.
- Updated Railway deployment guide with details on Medusa Worker.
- Small adjustments to the `worker_mode` option's TSDocs.

www/apps/docs/content/homepage.mdx

@@ -160,6 +160,15 @@ Medusa provides the essential building blocks that developers can put together t
 Learn about all the new features and enhancements in Medusa.
 
 <DocCardList colSize={4} items={[
+  {
+    type: 'link',
+    href: '/development/worker-mode',
+    label: 'Worker Mode',
+    customProps: {
+      icon: Icons['server-stack-solid'],
+      description: 'Deploy separate worker and server instances of Medusa.',
+    }
+  },
   {
     type: 'link',
     href: '/medusa-react/overview',
@@ -178,15 +187,6 @@ Learn about all the new features and enhancements in Medusa.
       description: 'Create subscribers with an improved developer experienece.',
     }
   },
-  {
-    type: 'link',
-    href: '/development/api-routes/create',
-    label: 'API Routes',
-    customProps: {
-      icon: Icons['server-stack-solid'],
-      description: 'Create API Routes with an improved developer experience.',
-    }
-  },
 ]} />
 
 <!-- vale docs.HeadingPunctuation = NO -->