LPS-46840 LPS-48112 Support importing ZIP of liferay-docs/develop/learning-paths

Rebase of https://github.com/brianchandotcom/liferay-plugins/pull/3375

Hey Brian,

This is required for dev.liferay.com and we should backport that to 6.2.x.
It would be great if you can backport it, otherwise let me know and I'll send you a pull with the backport once it's in master