remove code-server stack, add vpinball.pivoine.art web app link

Drops the code-server stack entirely and its PulseNode bookmark/env
reference. Adds vpinball.pivoine.art to the PulseNode Web Apps list.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

pulsenode/config/config.yml

@@ -23,9 +23,6 @@ groups:
           - name: Gitea
             href: https://${TRAEFIK_HOST_GITEA}
             icon: gitea
-          - name: Code Server
-            href: https://${TRAEFIK_HOST_CODE}
-            icon: coder
           - name: Immich
             href: https://${TRAEFIK_HOST_IMMICH}
             icon: immich
@@ -58,6 +55,8 @@ groups:
             href: https://roux.pivoine.art
           - name: triggershell.falcon.pivoine.art
             href: https://triggershell.falcon.pivoine.art
+          - name: vpinball.pivoine.art
+            href: https://vpinball.pivoine.art
 
   - name: Services
     widgets: