feat: remove ahref plugin and update Google Tag Manager integration

[alicanerdurmaz]

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Bugs / Features

• Related issue(s) linked
• Tests for the changes have been added
• Docs have been added / updated
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What is the current behavior?

Docs site removed Google Analytics/gtag integration and Ahrefs tracking, and banner analytics now send events to GTM’s dataLayer instead of GA.

What is the new behavior?

• GA/gtag tracking is removed from Docusaurus config and banner modal.
• Ahrefs plugin is removed.
• GTM remains enabled, with banner view events pushed to dataLayer via a shared gtm utility.

fixes (issue): N/A

Notes for reviewers

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