[ctauchen]

Adds a site-wide announcement bar for the Calico and Lynx community workshop and happy hour at KubeCon NA 2026, with copy from marketing.

Jira: https://tigera.atlassian.net/browse/DOCS-3128

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What changed in this PR

Adds a site-wide announcement bar promoting the Calico and Lynx KubeCon NA 2026 workshop and happy hour.

Changes:

• Adds registration announcement copy and link.
• Configures announcement colors and dismissibility.

File	Description
docusaurus.config.js	Adds the KubeCon NA 2026 announcement bar configuration.

_{Review effort: Lite}