Added env variable to deploy-docs action

[madeinoz67]

Google analytics in mkdocs is not seeing the token via env

Description

Fixes google analytics on deployed github pages site

Motivation and Context

issue #8 - Analytics not working

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Only

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

Issues this PR Closes?

closes issue #8