Remove local ForgeOS files; point Day30 link to Vercel deployment

- Delete assets/forgeos/ (html, css, 8 images) — no longer needed
- Delete pages/project-pages/forgeos.html — project abandoned
- Day30.html: update link from local assets/forgeos/forgeos.html → https://forgeos-ashy.vercel.app

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: PyMite6941