guides (python, deno, bun): update to dhi-only and remove external repo

[craig-osterhout]

Description

Doing a couple of easy guides plus the popular Python guide to get some feedback and agent-priming before tackling the other guides.

• Updated guides to DHI-only. DHI Community is now free.
• Updated guides away from git clone. Maintaining and updating separate repos is a burden. It's a bit more copy-paste for users, so will monitor feedback closely. Pondering a faux file browser & copy-paste-to-create-all-files component to make the UX slicker for scaffolding samples.
• Updated the Python linting and typing topic to offer a container-based alternative to installing tools locally.

Related issues or tickets

ENGDOCS-3308

Reviews

• Editorial review

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[docker-agent]

Assessment: 🔴 CRITICAL

One high-severity content accuracy issue found: the requirements.txt shown in python/containerize.md omits uvicorn, which is required by the Dockerfile's CMD. Users following the guide will build a container that immediately fails to start. See inline comment for details and fix.

[craig-osterhout]

/review

[docker-agent]

Test

[docker-agent]

Test

[docker-agent]

Test

[docker-agent]

Assessment: 🟡 NEEDS ATTENTION

This PR cleanly removes the external sample-repo dependency and replaces it with inline "create the application" steps for the Bun, Deno, and Python guides, and migrates all three to DHI-only base images. The approach is well-structured. A couple of items to fix:

Additional note (can't pin inline — unchanged context lines):

In content/guides/python/containerize.md and content/guides/python/develop.md, the directory tree listings use single-space indentation after │ (e.g., │ ├── app.py) rather than the three-space format used in the Bun and Deno guides added in this same PR (e.g., │ ├── app.py). These are pre-existing context lines so they can't be commented inline, but they're worth fixing for consistency.

[docker-agent]

Assessment: 🟢 APPROVE

This PR cleanly migrates the Bun, Deno, and Python guides to DHI-only and removes the external git clone dependency. The changes are well-structured, the Dockerfile multi-stage build pattern is correct, port numbers are consistently updated (8001→8000), and the Kubernetes manifests are properly aligned. Two minor findings noted via inline comments.