Add required property to sample Nanoc configuration file
What does this Merge Request do?
Fixes builds that fail using this process: https://gitlab.com/gitlab-org/gitlab-development-kit/blob/master/doc/howto/gitlab_docs.md#setting-up-gitlab-docs.
Merge Request checklist
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Tests added for new functionality. If not, please raise Issue to follow-up. -
This change is backward compatible. If not, please include steps to communicate to our users. -
Documentation added/updated, if needed. -
gdk doctor
test added, if needed.