fix the netlify build

[kmala]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Netlify build is failing because of mkdocs command not available in the path.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

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[nrb]

/lgtm

Netlify jobs built, where they wouldn't before.

[elmiko]

/approve
/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: elmiko

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