Removing the Developer survey banner and nav bar link from the Keras.io landing page

[buildwithsuhana]

This PR removes the 2025 developer survey banner and survey link in the navbar as the survey is now closed.

The landing page now looks like:

[gemini-code-assist]

Summary of Changes

Hello @buildwithsuhana, 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 Keras.io website by systematically removing all references to the recently concluded 2025 Developer Survey. The changes ensure that the website's navigation and prominent calls to action are current, directing users to relevant and active content, specifically highlighting the Keras 3.0 release instead of an expired survey.

Highlights

• Survey Link Removal: The '2025 Survey' link has been removed from the main navigation menu across the Keras.io website, including the base template and Keras 3 specific pages.
• Landing Page Navigation Cleanup: The 'Take Our Survey!' link and '2025 SURVEY' list item have been removed from the navigation sections on the Keras.io landing page.
• Banner Button Update: The prominent 'TAKE OUR SURVEY!' banner button on the landing page has been replaced with a 'KERAS 3.0 RELEASED' button, directing users to the latest Keras version.

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[gemini-code-assist]

Code Review

This PR removes the 2025 developer survey banner and survey link in the navbar from the Keras.io landing page. The changes involve modifications to theme/base.html, theme/keras_3.html, and theme/landing.html to remove the survey links and update a button on the landing page. I have identified one issue related to a missing newline character at the end of the theme/landing.html file.

[sachinprasadhs]

There is a conflict, which needs to be resolved