WIP chore: refactor docs into structured sections

[samsja]

Summary

• Reorganize flat docs into 5 main sections: Getting Started, Architecture, Performance, Single Node, Multi Node
• Port all existing content from 15 flat files into the new structure
• Update mint.json navigation to reflect new organization
• Add placeholder pages for performance topics (MoE, CP, memory efficiency) to be filled in later

Structure

docs/
├── getting-started/     (installation, quickstart, config-system, development)
├── architecture/        (overview, orchestrator, trainer, inference, environments,
│                         trajectories, checkpointing, pipeline-rl, async-rl)
├── performance/         (overview, moe, context-parallelism, memory-efficiency,
│                         distributed-inference, benchmarking)
├── single-node/         (overview, sft, rl, lora, distillation, multimodal)
├── multi-node/          (overview, slurm, kubernetes, sft, rl)
└── top-level            (supported-models, custom-algorithms, metrics, logging, troubleshooting)

Test plan

• Verify mint.json renders correctly on Mintlify
• Check all internal links resolve
• Review content completeness in each section

🤖 Generated with Claude Code

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Note

Low Risk
Documentation-only reorganization; main risk is broken internal links/asset paths or missing content during the move.

Overview
Restructures docs into a new hierarchy under getting-started/, architecture/, performance/, single-node/, and multi-node/, including new overview/entrypoint pages (e.g. docs/index.md, architecture/overview.md) and placeholder performance topics.

Removes and relocates prior flat docs (notably deployment.md, entrypoints.md, kubernetes.md, multi_run_manager.md) into the new sectioned pages (e.g. multi-node/kubernetes.md, single-node/lora.md, single-node/rl.md) and updates links/assets paths and a handful of wording/typo fixes.

Updates Mintlify navigation in docs/mint.json to match the new structure and page locations.

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