Provide redirect for broken UI link as temporary fix

[felicitymay]

Why:

This is a partial fix for #35843. It adds a redirect from the broken URL to the correct article.

The full fix will require an update to the UI which will take a little longer to arrange and publish.

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

The URL used in the UI: https://docs.github.com/actions/getting-started-with-github-actions will automatically redirect to the article https://docs.github.com/en/actions/writing-workflows/quickstart once this change is deployed to production.

This redirect will be useful to users of GitHub Enterprise Server longer term, but GitHub cloud users will stop using the redirect once the UI is updated.

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 a 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.

[github-actions]

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The table contains an overview of files in the content directory that have been changed in this pull request. It's provided to make it easy to review your changes on the staging site. Please note that changes to the data directory will not show up in this table.

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Content directory changes

You may find it useful to copy this table into the pull request summary. There you can edit it to share links to important articles or changes and to give a high-level overview of how the changes in your pull request support the overall goals of the pull request.

Source	Preview	Production	What Changed
actions/writing-workflows/quickstart.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10

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

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[github-actions]

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