Create all /vision directories

[jacksgt]

Standardize and define directories under /vision:

• /vision/pki: certificates for puppet etc., not replicated, backed up
• /vision/data: application data, e.g. /vision/data/nextcloud/, replicated, backed up
• /vision/{conf|etc}: configuration for applications, e.g. `/vision/conf/redalert/config.json, managed via puppet, not replicated, backed up
• /vision/logs: application logs (if any), e.g. /vision/logs/webshop/apf.log, not replicated, not backed up, rotated
• ???

[jacksgt]

Follow-ups:

• migrate application config
• adjust bareos config