Add links to live demo at app.eryxon.eu

- Add "Try Demo" as primary hero action button
- Update introduction callout with direct demo link

Author: claude

website/src/content/docs/index.mdx

@@ -7,11 +7,15 @@ hero:
     MES for <span class="text-primary">Job Shops</span>
   tagline: Open source production tracking for custom manufacturing. Real-time operator terminals, capacity planning, and ERP integration.
   actions:
+    - text: Try Demo
+      link: https://app.eryxon.eu
+      icon: external
+      variant: primary
     - text: Get Started
       link: /guides/quick-start/
       icon: right-arrow
-      variant: primary
-    - text: View on GitHub
+      variant: minimal
+    - text: GitHub
       link: https://github.com/SheetMetalConnect/eryxon-flow
       icon: external
       variant: minimal

website/src/content/docs/introduction.md

@@ -4,7 +4,7 @@ description: The simple, elegant and powerful manufacturing execution system tha
 ---
 
 :::note[Early Access]
-Heads up – this is an early version. Free during early access, but expect some bugs or downtime. See the [Hosted Version](/hosted-version) page for details on the hosted demo and future plans.
+Heads up – this is an early version. Free during early access, but expect some bugs or downtime. [Try the demo](https://app.eryxon.eu) or see the [Hosted Version](/hosted-version) page for details.
 :::
 
 **The simple, elegant and powerful manufacturing execution system that your people will love to use. Made for metals fabrication.**