[fa] Remove kubeweekly shortcode from homepage

[mamrezb]

Summary

• Remove the deprecated {{< kubeweekly >}} shortcode call from the Farsi homepage
• The KubeWeekly signup form has already been removed from main
• The RTL overflow issue reported in #55093 (comment) resolves on its own once dev-1.33-fa.1 merges into main, as the legacy layout files causing it no longer exist there

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[xirehat]

@mamrezb It seems still exist in main page, I think it's better to update Farsi main page like other localization(copy the main page from main branch)

[mamrezb]

@xirehat The overflow in the deploy preview is coming from the legacy kubeweekly form in layouts/index.html. But that file doesn't exist on main anymore (it was already deleted). So once dev-1.33-fa.1 merges into main through #55093, the issue resolves on its own regardless of this PR. This PR is just cleanup to remove a dead shortcode call.

[xirehat]

@mamrezb OK, If you think this PR is ready to be merged, change it to Open state