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>

README.md

@@ -16,7 +16,6 @@ Each stack is independently deployable with its own `compose.yml` and `.env`. Al
 | `gitea` | Git hosting + CI runner | gitea, runner, db |
 | `coolify` | Deployment platform | coolify, realtime, redis, db |
 | `passbolt` | Password manager (GPG-encrypted, team sharing) | passbolt, db |
-| `code` | Browser-based VS Code IDE with Anthropic API access | code |
 | `headscale` | Self-hosted Tailscale control server (WireGuard mesh VPN) | headscale |
 | `obsidian` | CouchDB sync backend for the Obsidian LiveSync plugin | obsidian |
 | `pulsenode` | Infrastructure dashboard - monitors all the stacks above | pulsenode |