fix broken links

[cmppoon]

What does this change

I fixed some broken links that lead to 404 not found page. I hope this helps.

What issue does it fix

Broken links

Notes for the reviewer

This is my first PR, please let me know if any changes needed. Thanks.

Checklist

• Did you write tests?
• Did you write documentation?
• Did you change porter.yaml or a storage document record? Update the corresponding schema file.
• If this is your first pull request, please add your name to the bottom of our Contributors list. Thank you for making Porter better! 🙇‍♀️

Reviewer Checklist

• Comment with /azp run test-porter-release if a magefile or build script was modified
• Comment with /azp run porter-integration if it's a non-trivial PR

[schristoff]

Thank you so much for this, and congratulations on your first contribution to Porter! 🥳