Use relative docify paths (#14672)

* Use relative docify paths

Bumping the docify version and using relative paths is needed for
the monorepo to find the test files in the new workspace.

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* update docify to fix paths issue

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Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: Sam Johnson <sam@durosoft.com>