docs: refocus Alby Hub deployment guides on self-hosting

[reneaaron]

Housekeeping pass over the Alby Hub guides to put self-hosting front and centre and tidy up some links.

• Deployment guides lead with self-hosting options; renamed the cloud guide page to Cloud Hosting and added a redirect for the old URL.
• Updated a few onboarding/FAQ pages so setup links point at the deployment guides.
• Refreshed internal links and removed some stale references.

Mostly copy and link tidying — no behavioural docs changes.

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