feat: add blog post about new Torrust Tracker Demo

[josecelano]

Summary

Adds a new blog post announcing the launch of the dedicated Torrust Tracker Demo on Hetzner.

Post: /blog/new-torrust-tracker-demo

Content covered

• Background: the original combined Torrust Demo (Tracker + Index) on Digital Ocean and why it was valuable
• Why we split the demo into two independent projects (July 2025)
• Building the Torrust Tracker Deployer before migrating — and using this deployment as its final end-to-end test
• The new demo setup: Hetzner hosting, MySQL (instead of SQLite), IPv6 support
• Observability: three Grafana dashboards (overview, UDP tracker, HTTP tracker) with screenshots
• Submitted to Newtrackon — with a note about the IPv6 routing fix and uptime recovery
• Why we share all of this: eating our own cooking, building for AI agents
• What's next: three planned follow-up posts (deployment deep-dive, IPv6 floating IP, Newtrackon tips)

Files added

• src/routes/blog/new-torrust-tracker-demo/ — post route (metadata, server loader, Svelte page)
• static/images/posts/new-torrust-tracker-demo/ — cover, Grafana screenshots, Newtrackon screenshot, infographic summary
• static/blogMetadata.json — regenerated to include the new post

[josecelano]

ACK 0c291ba