* Add nextcloud_container_image_customizations_smb_enabled: true to configuration options
* revised variable to use "samba" not "smb"
* Move Samba for Nextcloud instructions into their own section
This keeps the initial vars.yml sample for installing Nextcloud minimal.
Samba is a rarely used optional feature and has no business being in the initial minimal configuration sample.
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Co-authored-by: Slavi Pantaleev <slavi@devture.com>
