guides: update python & add files component

[craig-osterhout]

Description

Updated Python guide

• Removed DOI in favor of DHI only. DHI Community is now free, so there's no reason to keep the DOI fallback path.
• Removed the git clone sample-app pattern. Maintaining external sample repos is a burden, and split source of truth between the docs and the sample.
• New file browser / scaffolding component. Lets users copy individual files or scaffold the whole project with one command. Replaces the role the cloned sample repo used to play.
• New "Secure your supply chain" topic highlighting what DHI gives you and how to attach matching attestations to your own image in CI.
• A bunch of smaller improvements: clearer intros for each topic, progressively updating the same app in all topics, ran and fixed issues, etc.

https://deploy-preview-25206--docsdocker.netlify.app/guides/python/

Related issues or tickets

ENGDOCS-3308

Reviews

• Technical review
• Editorial review

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[docker-agent]

Assessment: 🟡 NEEDS ATTENTION

[dvdksn]

Reviewed the full guide — looks good, solid improvement. The inline sample + files component read well, naming and ports are consistent, and the multi-stage DHI Dockerfile is sound. Two notes on the scaffold path in the files shortcode, inline below: the heredoc delimiter one is worth fixing; the BOM one is a non-blocking follow-up.

[docker-agent]

Assessment: 🟡 NEEDS ATTENTION

This PR is a substantial, high-quality rework of the Python guide. The new file browser/scaffold component is well-implemented, the DHI-only approach is a good simplification, and the new supply chain topic is a valuable addition. Four issues found in the changed content.