chore: add kubecon na 2025 to announcement banner

[thisisobate]

Fixes #1270

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[gemini-code-assist]

Summary of Changes

Hello @thisisobate, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on updating the website's front-facing information by enabling and configuring an announcement banner to advertise KubeCon + CloudNativeCon North America 2025. Concurrently, it ensures that the site's external content, specifically for community and specification details, is current by updating the respective Git submodules to their latest versions.

Highlights

• Announcement Banner Activation: The website's announcement banner has been activated and updated to promote KubeCon + CloudNativeCon North America 2025.
• Submodule Update: Community Content: The external-content/community Git submodule has been updated to its latest commit.
• Submodule Update: Specification Content: The external-content/specification Git submodule has been updated to its latest commit.

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[gemini-code-assist]

Code Review

This pull request adds an announcement banner for KubeCon NA 2025. The implementation is mostly correct, but I found an HTML syntax error in the banner's content string that could lead to rendering issues. I've provided a suggestion to fix the invalid HTML.

[thisisobate]

Thanks for the approval @beeme1mr ; feel free to merge! 🥳