docs: add Ollama prerequisites to tutorials (#182)

[kalisingh2277]

PR Description: Issue #182

Title

docs: add Ollama prerequisites to tutorials (#182)

Description

This PR addresses issue #182 where the introductory tutorials use Ollama as the default LLM provider but do not mention that it must be installed and running. This can lead to frustration for new users who encounter connection errors.

Changes

• first_model.md: Added a "Prerequisites" section with installation and setup instructions for Ollama.
• negotiation_model_tutorial.md: Added a "Prerequisites" section with a cross-reference to the main setup guide.
• getting_started.md: Added an "LLM Backend Setup" section to distinguish between local (Ollama) and cloud (OpenAI/Gemini) providers.

Verification

• Ran ruff check and ruff format on documentation files.
• Ran codespell to verify spelling in the new sections.

Related Issues

Closes #182

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[IlamaranMagesh]

Weird formatting bug, here

[IlamaranMagesh]

Suggested change

	Like the introductory tutorial, this guide uses **Ollama** as the default LLM provider.
	The example uses **Ollama** as the default LLM provider.

There will be new tutorials added later, maybe this makes sense?

[IlamaranMagesh]

I've not looked in depth if the tutorials are in sync with new mesa versions. If it's checked and made necessary changes, it makes sense to update it one go.

[kalisingh2277]

I've not looked in depth if the tutorials are in sync with new mesa versions. If it's checked and made necessary changes, it makes sense to update it one go.

I have made the necessary changes. Kindly review them and let me know if there are any further enhancements required.