Turn homepage into a product-led GroundControl showcase - #7

What changed

• Reframed the homepage around what GroundControl actually lets people do: build, deploy and operate VPS workloads from one control plane.
• Made the ChatGPT + GroundControl authenticated workflow a first-class product story without claiming that server credentials are handed to the conversation.
• Replaced the fabricated dashboard/metrics preview with truthful product copy and workflow evidence.
• Added feature coverage for deployments, runtime, terminal, Intelligence, Cloudflare/domains and self-hosted ownership.
• Added real production-template examples sourced from the GroundControl template docs, including Existing Compose, Odoo Community, Next.js SaaS, FastAPI + worker, monorepo and microservices + ops.
• Kept the one-command installer and GitHub/open-source conversion paths prominent.
• Updated SEO metadata and homepage tests.
• Added MEDIA_CAPTURE.md with a concrete capture plan for real screenshots and short videos from Templates, Deployments, Runtime, Terminal, Intelligence and domains. The rule is explicit: no fake UI, fake metrics or invented product states.

Media note

The current pass intentionally does not manufacture replacement product graphics. The next media pass should use authenticated real captures from GroundControl and the real ChatGPT/GroundControl session screenshot.