docs: add azure lab deployment guide (all 3 profiles)

Comprehensive step-by-step manual for deploying IT-Stack labs on Azure:
- Profile Phase1: Standard_D8s_v4 single VM, Labs 01-03, ~\/day
- Profile FullStack: Standard_E16s_v4 single VM, all 20 modules, Labs 01-05, ~\/day
- Profile Lab06HA: 8-VM production HA cluster, Labs 01-06, ~\/day

Covers: prerequisites, deploy commands, SSH access, running labs,
Ansible inventory setup, jump host config, cost control, snapshots, troubleshooting

Author: RedjiJB