docs: move dataset generation guide to introduction

[xarthurx]

Summary

• Move the Airfoil dataset generation submission script into a new Introduction page
• Use a shorter sidebar label: Data Generation (Slurm)
• Link from the generic Slurm utilities page to the new guide
• Replace informal HPC-team wording with a cluster-policy warning

Screenshot

Validation

• uv run python -m sphinx -E -b dirhtml docs docs/_build/dirhtml
• uv run python -m sphinx -b doctest docs docs/_build/doctest
• uvx pre-commit run --files docs/index.md docs/introduction/dataset_generation_slurm.md docs/utils/slurm.md engibench/utils/slurm/init.py tests/tools/fake_sbatch.py

Addresses #261

[Copilot]

Pull request overview

This PR relocates the Airfoil dataset-generation Slurm submission guide from the Slurm utilities page into the Introduction section, improving discoverability and aligning wording with cluster policy guidance.

Changes:

• Add a new Introduction page documenting the end-to-end “Dataset Generation via Slurm” workflow (Airfoil example).
• Link to the new guide from the Slurm utilities documentation and update the sidebar label.
• Update Slurm utility docstring wording to replace informal HPC-team phrasing; fix the fake_sbatch test tool shebang.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/tools/fake_sbatch.py	Fix shebang to the standard /usr/bin/env python3.
engibench/utils/slurm/__init__.py	Update reduce() docstring wording around login-node size limits / cluster policy.
docs/utils/slurm.md	Add link to the new dataset-generation guide and remove the embedded Airfoil example script.
docs/introduction/dataset_generation_slurm.md	New end-to-end dataset-generation submission guide (Airfoil example).
docs/index.md	Add the new guide to the Introduction toctree with the requested sidebar label.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.