Refactor the docs workflow

[AhmedBasem20]

Describe the changes you have made in this PR

Some improvements to the recently merged PR #59

• Moved the download artifact step into a reusable action.
• Separated the deploy job from the build job.

[etpeterson]

Looks good. Mostly unrelated to this - another PR possibly. You could add a badge for the documents workflow. We have badges for the unit testing and analysis workflows, so it makes sense to have one for this too. https://docs.github.com/en/actions/monitoring-and-troubleshooting-workflows/adding-a-workflow-status-badge