docs: add Custom Python component documentation

[MonikaFeigler]

Jira issue(s): PROOF-XXX (to be created)

Changes:

• Add new documentation page for the Custom Python application at /components/applications/custom-python/
• Add navigation entry under Components → Applications
• Add 5 UI screenshots covering the component overview, Python version selection, inline code editor, User Parameters, and Git repository configuration
• Add "Using Kai to Configure Custom Python" section with example prompts and a tip for getting better results from Kai (addresses review feedback from @jordanrburger)

Content is sourced from the component-custom-python README and covers:

• Comparison to Python Transformations
• Configuration parameters (Python version, source, Git settings, user parameters)
• Code example using CommonInterface
• Git repository integration with dependency management (pyproject.toml/uv.lock vs requirements.txt)
• How Kai can help configure, generate code for, and troubleshoot the component

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Notes for reviewer

• Verify the example repo link is publicly accessible.
• Kai section — Please verify the described capabilities (code generation, credential configuration, Git setup, job troubleshooting) accurately reflect what Kai can do today with Custom Python.
• No redirect_from in front matter — intentional since this is a new page with no legacy URL.

Release Notes

Justification, description

New user documentation for the Custom Python component (application), enabling users to find guidance on configuring and using the component directly from help.keboola.com. Includes a section highlighting Kai as an AI-assisted way to configure the component.

Plans for Customer Communication

N/A

Impact Analysis

Documentation-only change. No functional impact.

Deployment Plan

Standard merge to main — auto-deployed via Jekyll build.

Rollback Plan

Revert the merge commit.

Post-Release Support Plan

N/A

Link to Devin session: https://app.devin.ai/sessions/f084e35d727b42c2843b39ebf5d91988
Requested by: @MonikaFeigler

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[devin-ai-integration]

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[MonikaFeigler]

Summary

• Add new documentation page for the Custom Python application at /components/applications/custom-python/
• Add navigation entry under Components → Applications
• Rewrote content to be user-facing rather than developer-facing: replaced 9 code examples with a single minimal snippet and a link to developer docs,
  removed raw JSON configuration examples, removed JSON parameter key names from UI field descriptions
• Added 5 UI screenshots covering the component overview, Python version selection, inline code editor, User Parameters, and Git repository configuration

[MonikaFeigler]

@kudj can you please review this docs for custom python please?

[jordanrburger]

It would be great to have a note on this page about the possibility of configuring the custom python component easily with Kai.

[MonikaFeigler]

@jordan.burger great comment. I added the section. Thanks.

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

[devin-ai-integration]

Added a new "Using Kai to Configure Custom Python" section (commit aa4cdf9) that covers:

• Example prompts for creating configurations, setting up integrations, and debugging jobs
• Description of what Kai can do with the Custom Python component (code generation, credential configuration, Git setup, troubleshooting)
• A tip encouraging users to be specific with their requests for better results

Please review and let me know if the scope/tone fits what you had in mind!

[MonikaFeigler]

@kudj can you please review?

[devin-ai-integration]

❌ Cannot revive Devin session - the session is too old. Please start a new session instead.

[MonikaFeigler]

@soustruh review please.