Clean up GitHub deployments and add releases

[Hugo0]

Stale Heroku deployments

https://github.com/Hugo0/wordle/deployments shows old Heroku deployment entries (2023-2025). These are outdated since we moved to Render. Should either:

• Delete them all via the GitHub Deployments API
• Or set up Render to push deployment status to GitHub (via deploy hook + GitHub Action)

GitHub Releases

No releases exist yet. Consider:

• Tagging a v1.0 for the current state (65 languages, word pages, definitions, AI images, analytics)
• Setting up a release process for major milestones