Remove KubeCon NA 2025 to Announcement banner

[RainbowMango]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

This PR reverts #908.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

[gemini-code-assist]

Summary of Changes

Hello @RainbowMango, 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 updates the Karmada website by modifying the global announcement banner. The previous time-sensitive promotion for KubeCon NA 2025 has been removed and replaced with a call to action for users to star the Karmada repository on GitHub. This change ensures the banner content remains relevant and encourages ongoing community engagement with the project.

Highlights

• Announcement Banner Update: The website's announcement banner has been updated to remove the KubeCon NA 2025 promotion.
• GitHub Star Promotion: The KubeCon banner has been replaced with a persistent message encouraging users to star the Karmada project on GitHub.

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[gemini-code-assist]

Code Review

This pull request reverts the announcement banner from a KubeCon promotion back to the 'star on GitHub' message. The change is correct and achieves its goal. However, I've noticed that the announcement bar content is not internationalized. It will appear in English for all users, including those browsing the Chinese version of the site. I've added a comment with a suggestion to address this for a better user experience.

[RainbowMango]

cc @windsonsea

[windsonsea]

Thanks
/lgtm
/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: windsonsea

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