Create Deploy overview page and cross-link deployment targets

[ggfevans]

Parent

#25

What to build

Create a Deploy overview that helps users choose the right Rackula deployment path and cross-links every available or planned target.

This should make Docker, LXC, Proxmox Community Scripts, TrueNAS Marketplace, and Unraid status discoverable from one place. The overview should not duplicate full install instructions from target-specific pages; it should explain when to choose each path and route users onward.

Acceptance criteria

• Deploy overview links to Docker self-hosting from docs: Write self-hosting guide #8.
• Deploy overview links to Proxmox LXC and Community Scripts from Document Proxmox LXC and Community Scripts install path #23.
• Deploy overview links to TrueNAS Apps Market from Document TrueNAS Apps Market install path #24.
• Deploy overview links to Unraid status from Document Unraid as planned and not yet available #28 and clearly indicates it is planned/not yet available.
• The overview is reachable from the left sidebar under Deploy.
• The homepage or relevant docs entry points link to Deploy.
• Canadian/British spelling is used where applicable.
• npm run build passes.

Blocked by

• docs: Write self-hosting guide #8
• Document Proxmox LXC and Community Scripts install path #23
• Document TrueNAS Apps Market install path #24
• Document Unraid as planned and not yet available #28
• Refit sidebar IA and navigation labels #26