update doc site deployment

[rem1776]

Description
updates the docs workflow to use github's own action for deployment instead of the third party one I had used. I used a more recent example from seth with the current github recommended way to deploy.

It used to be required that you had an explicit branch (gh-pages) to deploy to the site, but this update will change it to an artifact (saved in the action) instead.

Fixes # (issue)

How Has This Been Tested?
testing on my fork

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• New check tests, if applicable, are included
• make distcheck passes

[underwoo]

@rem1776 currently, the deploy only works from the 'main'|'master' branch. At least, that is what I found in my tests.