[peterschmidt85]

Fixes docs that were wrong, outdated, or broken, found by reviewing every page against the code.

• Copy-paste fixes: AWS IAM policy JSON, Azure create-for-rbac, required Azure/GCP config fields, Slurm, Axolotl, and SMG PD configs
• Outdated facts: backend support lists, GPU defaults, model URL, probe readiness, idle_duration defaults, Vast.ai spot, Slurm guide claims
• Broken links: 18 fixed, including the UI's installation#set-up-the-cli link (old anchor kept for released UIs)
• Examples: Models section removed and empty pages deleted (with redirects), Llama 2 snippets replaced with Qwen3-4B
• Upgrade guide: 0.22 section, CLI compatibility and rolling upgrades rules
• Protips: Agents, Working directory, Files and repos, and Reservations sections; reworked Fleets; Cloud quotas fixes

Verified with a full mkdocs build and link scan, and by parsing all changed YAML with the config models.

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