Remove decorative pipeline placeholder from landing page

[trissim]

Summary

• remove the fabricated pipeline diagram from the landing-page hero
• delete all CSS that existed only to render that placeholder
• let the page transition directly from the release summary to the real OpenHCS desktop interface

Verification

• website build validation passed
• tests/unit/test_build_website.py: 8 passed
• desktop visual inspection passed
• no remaining pipeline-placeholder selectors or markup

[Copilot]

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[augmentcode]

^{PR Risk Analyzer Agent🛡️}

Risk Analysis 🛡️ · Low Risk

✅ Approved — Low-Risk Change

Details

• Pure deletion (0 additions, 81 deletions) removing the decorative .pipeline-visual block from the landing-page hero and the CSS that only rendered it.
• Static HTML/CSS only — no executable code paths, APIs, schemas, auth, infra, or secrets involved.
• Removed CSS selectors (incl. responsive media-query rules) map exactly to the removed markup; no orphaned or dangling references.
• No opted-out directories touched; build validation and test_build_website.py reported passing.

[augmentcode]

^{Deep Code Review Agent🐛}

Review completed with 0 suggestions.