Update gha pr instructions 5165

[roslynwythe]

Fixes #6

What changes did you make?

• moved decdoe to yml

[github-actions[bot]]

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git checkout -b roslynwythe-update-gha-pr-instructions-5165 gh-pages
git pull https://github.com/roslynwythe/website.git update-gha-pr-instructions-5165

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[github-actions[bot]]

Want to review this pull request? Take a look at this documentation for a step by step guide!

From your project repository, check out a new branch and test the changes.

git checkout -b roslynwythe-update-gha-pr-instructions-5165 gh-pages
git pull https://github.com/roslynwythe/website.git update-gha-pr-instructions-5165

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Note that CONTRIBUTING.md cannot previewed locally; rather it should be previewed at this URL:

https://github.com/roslynwythe/website/blob/update-gha-pr-instructions-5165/CONTRIBUTING.md  

[roslynwythe]

GH Actions logs appear to show WR Add Pull Request Instructions #19 running from

##[debug]ref = 'refs/heads/update-pr-instructions-contrib-5165'
##[debug]commit = 'e8bbfa59d6d78cee958563414f66aba7620de38a'

which was the default branch. I changed the default branch, retrying