Add redirect script for update conflict page in troubleshooting guide

[CamSoper]

Implement a redirect script to guide users to the new update conflict page when accessing the troubleshooting guide.

Fixes pulumi/pulumi#20846

<soapbox>
We really need a URL shortener. This type of fix doesn't scale and adds technical debt to a repo that already has more than enough.

Thank you for attending my TED Talk. 🎤⬇️
</soapbox>

Edit: pulumi/pulumi#20847

[claude]

Documentation Review

I've reviewed the changes in this PR. Overall, this is a simple and effective solution to preserve backward compatibility for the old #conflict anchor link.

Issues Found

1. Missing newline at end of file (line 61 in content/docs/support/troubleshooting/_index.md)

The file does not end with a newline after the closing </script> tag. According to AGENTS.md, "Markdown: Must always end with a newline."

Suggestion:

</script>

(Add a blank line after </script>)

Observations

✅ The redirect target /docs/support/troubleshooting/common-issues/update-conflicts/ is correct and the file exists
✅ JavaScript implementation is simple and appropriate for this use case
✅ Comment in the code references the GitHub issue
✅ The redirect preserves SEO and user experience for existing links

Summary

The PR successfully addresses issue #20846 by redirecting users from the old #conflict anchor to the new dedicated page. Once the newline issue is fixed, this will be ready to merge.

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Mention @claude if you'd like me to review any additional changes or provide further feedback.

[pulumi-bot]

Your site preview for commit 64ef16c is ready! 🎉

http://www-testing-pulumi-docs-origin-pr-16441-64ef16c2.s3-website.us-west-2.amazonaws.com.