Removed Google Analytics from the Druid Website

[akulabs8]

Fixes #17647.

Description

To make Druid Website complaint with ASF Privacy Policy: Removed the details of google analytics and gtag from druid-website-src (Link to PR)
Thus, removed the gtag from here as well.

Removed the details of google analytics and gtag from druid-website-src (Link to PR)
Thus, removed the gtag from here as well.

---

This PR has:

• been self-reviewed.
  • using the concurrency checklist (Remove this item if the PR doesn't have any relation to concurrency.)
• added documentation for new or modified features or behaviors.
• a release note entry in the PR description.
• added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links.
• added or updated version, license, or notice information in licenses.yaml
• added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
• added unit tests or modified existing tests to cover new code paths, ensuring the threshold for code coverage is met.
• added integration tests.
• been tested in a test Druid cluster.

[github-actions]

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It will be closed in 4 weeks if no further activity occurs. If you think
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Thank you for your contributions.

[gianm]

LGTM. Thank you!