Update deploy-github-pages.yml

[GeauxJD]

Updating workflow for gh pages to gh-pages branch

Describe your changes

Attempting to resolve further github pages issues with custom domain

Related issue number or link (ex: resolves #issue-number)

Checklist before opening this PR (put x in the checkboxes)

• This PR does not contain plagiarism
  • don’t copy other people’s work unless you are quoting and contributing it to them.
• I have signed off on all commits
  • signing off (ex: git commit -s) is to affirm that commits comply DCO. If you are working locally, you could add an alias to your gitconfig by running git config --global alias.ci "commit -s".