Replace old documentation links in the WPCLI commands

[dingo-d]

Describe your bug

Current commands point to: https://infinum.github.io/eightshift-docs/. While this URL will redirect to https://eightshift.com, it's better to have a direct link set there.

Steps to Reproduce

Type any --help command.

Expected behavior

Correct link should be shown

Screenshots, screen recording, code snippet

No response

Environment info

No response

Please confirm that you have searched existing issues in this repo.

Yes

Please confirm that you have searched in our documentation and couldn't find the answer.

Yes

Please confirm that your bug occurs with all plugins uninstalled and with the default WordPress theme active.

Yes