ci: fix mkdocs requirements for gh-pages

[mirzakopic]

Summary

Fixing the requirements needed for mkdocs and gh-pages publishing.

See below

What Type of PR Is This?

/kind documentation

Related Issue(s)

#26

Fixes #

Release Notes

NONE

[kcp-ci-bot]

Hi @mirzakopic. Thanks for your PR.

I'm waiting for a kcp-dev member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[embik]

/ok-to-test

[embik]

/approve

[kcp-ci-bot]

LGTM label has been added.

Git tree hash: 4a4668fe931f29518c281a20dfe12f24f4a44d7c

[kcp-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: embik

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