Please check if the PR fulfills these requirements

• The PR has no duplicates (please search among the Pull Requests before creating one)
• The PR follows our contributing guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

• What kind of change does this PR introduce?

Pass an extra option, -u when invoking mike deploy.

• What is the current behavior?

We use an alias called latest to point to the most recent of the docs. Problem is when we do mike deploy, it produces an error as latest is already taken.

• What is the new behavior?

By passing mike deploy -u we can "move" the alias as we produce newer versions.

• Does this PR introduce a breaking change?

No changes to the CLI

• Other information:

Tested locally

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