Update link to Awesome GitHub Copilot Customizations

[aaronpowell]

Why:

We don't maintain prompts in the awesome-copilot repo anymore, they were migrated to skills, so I'm updating this link to be to the website root.

Closes: github/awesome-copilot#817

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

Updating docs link

Check off the following:

• 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.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

[github-actions]

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Table of review links

Note: Please update the URL for your staging server or codespace.

The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on a staging server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
copilot/how-tos/configure-custom-instructions-in-your-ide/add-repository-instructions-in-your-ide.md	fpt ghec	fpt ghec	from reusable
copilot/tutorials/customization-library/prompt-files/create-readme.md	fpt ghec	fpt ghec	from reusable
copilot/tutorials/customization-library/prompt-files/document-api.md	fpt ghec	fpt ghec	from reusable
copilot/tutorials/customization-library/prompt-files/generate-unit-tests.md	fpt ghec	fpt ghec	from reusable
copilot/tutorials/customization-library/prompt-files/index.md	fpt ghec	fpt ghec	from reusable
copilot/tutorials/customization-library/prompt-files/onboarding-plan.md	fpt ghec	fpt ghec	from reusable
copilot/tutorials/customization-library/prompt-files/review-code.md	fpt ghec	fpt ghec	from reusable
copilot/tutorials/customization-library/prompt-files/your-first-prompt-file.md	fpt ghec	fpt ghec	from reusable

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

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[Copilot]

Pull request overview

This PR updates a reusable note in the Copilot docs to point readers to the current “Awesome GitHub Copilot Customizations” landing site, reflecting the migration away from prompt-file examples being maintained in the awesome-copilot repository docs.

Changes:

• Updated the external link for community-contributed prompt file examples from a specific repo doc path to the Awesome Copilot website root.

Show a summary per file

File	Description
data/reusables/copilot/prompt-files-preview-note.md	Updates the external reference for prompt-file examples to the new Awesome Copilot site entry point.

Copilot's findings

• Files reviewed: 1/1 changed files
• Comments generated: 1