docs: add AI Kit documentation

[jordanrburger]

Jira issue(s): N/A

Link to Devin run: https://app.devin.ai/sessions/89eab6093f3b4d03ac2e783911dcfe3c
Requested by: Jordan Burger (@jordanrburger)

Changes:

• Add new documentation page for AI Kit at /ai/ai-kit/
• Add AI Kit to the navigation under AI Features section
• Add AI Kit entry to the AI Features overview page

The documentation covers the three plugins available in AI Kit:

• Developer Plugin: Code review, security analysis, code mess detection/fixing, PR creation
• Component Developer Plugin: Building Keboola Python components with cookiecutter integration
• Data App Developer Plugin: Building Streamlit data apps with validate-build-verify workflow

---

Human review checklist:

• Verify installation commands are correct (the ai-kit repo README uses keboola/claude-kit in commands - confirm this matches actual functionality)
• Check if content accurately represents ai-kit capabilities
• Determine if screenshots or diagrams should be added
• Verify external GitHub links are correct and accessible

[devin-ai-integration]

🤖 Devin AI Engineer

I'll be helping with this pull request! Here's what you should know:

✅ I will automatically:

• Address comments on this PR. Add '(aside)' to your comment to have me ignore it.
• Look at CI failures and help fix them

Note: I can only respond to comments from users who have write access to this repository.

⚙️ Control Options:

• Disable automatic comment and CI monitoring

[Matovidlo]

@ZdenekSrotyr Can you go through documentation of Component developer plugin please to confirm it's correct? 🙂

[devin-ai-integration]

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

[Matovidlo]

LGTM I would like to see Zdenek opinion I know that the component developer role was extensivelly changed