Add Docs deployment

[egordon]

Our DOCS workflow hasn't actually been deployment to our environment since we migrated to Github Actions in #598

Adding this step should fix this.

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Before creating a pull request

• [ N/A ] Document new methods and classes
• [ N/A ] Format code with make format

Before merging a pull request

• [x] Set version target by selecting a milestone on the right side
• [ N/A, internal ] Summarize this change in CHANGELOG.md
• [ N/A ] Add unit test(s) for this change

[egordon]

Also manually ran deployment workflow: https://github.com/personalrobotics/aikido/actions/runs/1211485519