Fix registration link and clean up content

[AliciaGorriaran]

The exam registration page was replaced. I updated the link to the new certification registration page. Additionally the FAQ and handbook have been removed so I removed the "further reading" section of this page.

Why:

Closes:

What's being changed (if available, include any code snippets, screenshots, or gifs):

The exam registration page was replaced. I updated the link to the new certification registration page. Additionally the FAQ and handbook have been removed so I removed the "further reading" section of this page.

Check off the following:

• [ x] A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• [ x] The changes in this PR meet the docs fundamentals that are required for all content.
• [x ] All CI checks are passing and the changes look good in the review environment.

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Pull Request Overview

This PR updates the GitHub Certifications documentation to reflect changes in the certification program infrastructure. The main purpose is to fix a broken registration link and remove outdated content references.

Key changes:

• Updated the certification registration URL from the old examregistration.github.com domain to the new learn.github.com/credentials page
• Removed the "Further reading" section that contained links to FAQ and handbook pages that no longer exist

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Source	Review	Production	What Changed
get-started/showcase-your-expertise-with-github-certifications/about-github-certifications.md	fpt ghec	fpt ghec

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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