Reusable clarifying Actions is fully supported while Jekyll is not

[Sharra-writes]

Why:

Legacy Pages content is written as though Jekyll is the preferred method for accomplishing tasks, when it's no longer fully supported and Actions has largely taken its place. This reusable clarifies the change so new users don't get confused and begin by using a legacy method that will someday (hopefully) be deprecated. Does not close, but is linked to, #36740.

Closes:

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

The reusable is a callout meant to go at the top of relevant legacy articles.

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.

[Copilot]

Pull Request Overview

This PR adds a reusable callout clarifying that GitHub Actions is the recommended, fully supported alternative to Jekyll on legacy pages.

• Introduces a new note reusable for pages that still reference Jekyll
• Links to the Actions quickstart guide

[github-actions]

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Table of review links

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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
pages/setting-up-a-github-pages-site-with-jekyll/about-github-pages-and-jekyll.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.17 3.16 3.15 3.14
pages/setting-up-a-github-pages-site-with-jekyll/about-jekyll-build-errors-for-github-pages-sites.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.17 3.16 3.15 3.14
pages/setting-up-a-github-pages-site-with-jekyll/adding-a-theme-to-your-github-pages-site-using-jekyll.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.17 3.16 3.15 3.14
pages/setting-up-a-github-pages-site-with-jekyll/adding-content-to-your-github-pages-site-using-jekyll.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.17 3.16 3.15 3.14
pages/setting-up-a-github-pages-site-with-jekyll/creating-a-github-pages-site-with-jekyll.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.17 3.16 3.15 3.14
pages/setting-up-a-github-pages-site-with-jekyll/setting-a-markdown-processor-for-your-github-pages-site-using-jekyll.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.17 3.16 3.15 3.14
pages/setting-up-a-github-pages-site-with-jekyll/testing-your-github-pages-site-locally-with-jekyll.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.17 3.16 3.15 3.14
organizations/managing-organization-settings/managing-the-publication-of-github-pages-sites-for-your-organization.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.17 3.16 3.15 3.14	from reusable
pages/configuring-a-custom-domain-for-your-github-pages-site/about-custom-domains-and-github-pages.md	fpt ghec	fpt ghec	from reusable
pages/configuring-a-custom-domain-for-your-github-pages-site/index.md	fpt ghec	fpt ghec	from reusable
pages/configuring-a-custom-domain-for-your-github-pages-site/managing-a-custom-domain-for-your-github-pages-site.md	fpt ghec	fpt ghec	from reusable
pages/configuring-a-custom-domain-for-your-github-pages-site/troubleshooting-custom-domains-and-github-pages.md	fpt ghec	fpt ghec	from reusable
pages/configuring-a-custom-domain-for-your-github-pages-site/verifying-your-custom-domain-for-github-pages.md	fpt ghec	fpt ghec	from reusable
pages/getting-started-with-github-pages/configuring-a-publishing-source-for-your-github-pages-site.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.17 3.16 3.15 3.14	from reusable
pages/getting-started-with-github-pages/creating-a-custom-404-page-for-your-github-pages-site.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.17 3.16 3.15 3.14	from reusable
pages/getting-started-with-github-pages/creating-a-github-pages-site.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.17 3.16 3.15 3.14	from reusable
pages/getting-started-with-github-pages/deleting-a-github-pages-site.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.17 3.16 3.15 3.14	from reusable

Note There are more changes in this PR than we can show.

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

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