Add Kagenti → Rosso rebrand announcement banner

[Ibrahim2595]

Summary

Adds a dismissible announcement banner at the top of the landing page noting the upcoming Kagenti → Rosso rename:

NEW NAME — Kagenti is becoming Rosso — you'll see the new name reflected across all project sites soon.

It's styled as a light red-tinted bar with a brand-red accent and a NEW NAME pill, so it reads as a distinct announcement rather than blending into the existing dark event banner. The KubeCon event banner is hidden (markup kept, just hidden class added) so the rebrand message stands alone.

Changes

• index.html — new #rebrand-banner; hide the KubeCon #event-banner
• style.css — .banner-rebrand + .rebrand-pill styles (AA-compliant contrast)
• script.js — independent dismiss handler with session-storage persistence, mirroring the existing event-banner pattern

Notes

• Reuses the existing .banner system — no new patterns introduced.
• The event banner is only hidden, not deleted, so it's trivial to restore.

🤖 Generated with Claude Code

[mrsabath]

Summary

Clean, well-scoped frontend change. The new #rebrand-banner reuses the existing .banner system, dismissRebrandBanner() mirrors the established dismiss pattern with session-storage persistence, the close button has a proper aria-label, and the styling notes AA contrast. No new patterns introduced, no secrets, and the KubeCon banner is hidden rather than deleted so it's trivial to restore.

On the rebrand content: I flagged during review that the "Kagenti → Rosso" announcement has no linkable authorization anywhere in the org (no issue, PR, discussion, or repo references "Rosso"). The maintainer has confirmed out-of-band that the rename is sanctioned, so approving on that basis. Recommend linking the official rebrand announcement/decision in the PR description before merge so the public-facing claim has a paper trail.

DCO: now passing — commit re-signed with Signed-off-by since the first review pass.

Areas reviewed: Frontend (HTML/CSS/JS), Security, Commit conventions
Author: Ibrahim2595 (MEMBER — maintainer)
Commits: 1, signed-off: yes
CI status: passing (DCO ✓, add-to-project ✓)

[mrsabath]

suggestion (non-blocking) — this adds hidden to the live KubeCon #event-banner so the rebrand message stands alone. Just confirming that's intended: KubeCon NA (Nov 9–12) is still upcoming, so you're trading the event promo for the rename notice. The markup is kept (only the class added), so restoring it later is a one-line revert — no concern there. Mentioning only so the event-banner drop is a conscious call, not a side effect.

[rubambiza]

@mrsabath @Ibrahim2595 I know this is already merged, but I wanted to mention that it deviates from our kagenti commit attribution policy (both the commit and PR description). Just wanted to flag for future reference since @Ibrahim2595 was likely not around when the policy was instituted.

[Ibrahim2595]

@rubambiza Thanks for pointing it out. The work was rushed/urgent and it was my first contribution. I'll make sure to follow the contribution description template in later work.