docs: add model choice guides

[neubig]

• I have read and reviewed the documentation changes to the best of my ability.
• If the change is significant, I have run the documentation site locally and confirmed it renders as expected.

Summary of changes

Closes #507.

• Fold the /model slash command guidance into the main Language Model (LLM) Settings page, including one Agent Canvas screenshot for manual switching.
• Fold the model selection tool guidance into the same page, including one Agent Canvas screenshot and notes for SwitchLLMTool / switch_llm behavior.
• Remove the standalone model choice pages and dedicated sidebar group.

This PR was created by an AI agent (OpenHands) on behalf of the user.

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[all-hands-bot]

🟢 Good taste - Well-structured documentation that follows style guidelines, includes clear workflows with appropriate screenshots, and provides proper cross-references. The example profiles are clearly marked as examples, and all technical content is accurate.

[RISK ASSESSMENT]

• [Overall PR] ⚠️ Risk Assessment: 🟢 LOW
  Documentation-only change with no code modifications. Adds two new guides with screenshots and updates navigation. All internal links verified, screenshots match documented workflows, and content follows repository style guidelines.

VERDICT:
✅ Worth merging: Clear, well-organized documentation that properly explains model switching features.

KEY INSIGHT:
The documentation successfully balances practical examples (using concrete profile names in screenshots) with generality (clearly stating profile names are examples only), making it both illustrative and flexible for different deployment scenarios.

[neubig]

@OpenHands let's remove the two de-novo pages (and the sidebar) and just include the info that we have in the main LLM settings page. But include one screenshot for the /model command and one screenshot for the model selection tool.

[openhands-ai]

I'm on it! neubig can track my progress at all-hands.dev

[neubig]

Addressed in f9e8212: removed the two standalone model choice pages and sidebar group, then consolidated the /model command and model selection tool guidance into the main Language Model (LLM) Settings page with one screenshot for each workflow.

Validation: npx --yes mint@latest broken-links passed.

This comment was created by an AI agent (OpenHands) on behalf of the user.

[openhands-ai]

Since my last summary, there were no additional code or documentation changes.

Checklist:

• ✅ The PR comment request was fully addressed: the two standalone model choice pages and sidebar group were removed.
• ✅ The relevant /model command and model selection tool information was consolidated into the main LLM settings page.
• ✅ One screenshot remains for the /model command workflow and one for the model selection tool workflow.
• ✅ The extra screenshot and stale references were removed.
• ✅ The changes are concise and limited to the requested scope.
• ✅ Validation passed with npx --yes mint@latest broken-links.
• ✅ The commit was pushed to the existing PR branch, and PR docs: add model choice guides #508 was updated with a revised body and response comment.

No extraneous changes remain.