Update link to Awesome GitHub Copilot Customizations

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.

Author: aaronpowell

data/reusables/copilot/prompt-files-preview-note.md

@@ -1,3 +1,3 @@
 > [!NOTE]
 > * {% data variables.product.prodname_copilot_short %} prompt files are in {% data variables.release-phases.public_preview %} and subject to change. {% data reusables.copilot.prompt-files-available-in-editors %} See [AUTOTITLE](/copilot/concepts/prompting/response-customization#about-prompt-files).
-> * For community-contributed examples of prompt files for specific languages and scenarios, see the [Awesome GitHub Copilot Customizations](https://github.com/github/awesome-copilot/blob/main/docs/README.prompts.md) repository.
+> * For community-contributed examples of prompt files for specific languages and scenarios, see the [Awesome GitHub Copilot Customizations](https://awesome-copilot.github.com) repository.