docs: align Alby Hub self-hosting network guidance

[hermes-alby]

Summary

• add consistent network-security warnings to the Alby Hub flavors overview, Linux, and cloud-hosting guides
• bind Docker and update examples to 127.0.0.1:8080:8080 by default
• document safe LAN/VPN bindings, Docker-aware firewall restrictions, and restricted HTTPS reverse proxies
• distinguish the private Hub HTTP port from the public LDK peer port 9735

Context

Follow-up to getAlby/hub#2580 so the user guide matches the Hub repository's self-hosting guidance and Docker defaults.

Verification

• git diff --check
• verified balanced GitBook hint/content-ref blocks, code fences, and frontmatter
• cross-checked Docker port mappings against the current official Hub Compose file

Docs-only change; this repository does not provide a local docs build or lint command.

[coderabbitai]

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