Add llms.txt generation tutorial

[TomeHirata]

As part of the real use case tutorial, this PR adds an end to end tutorial for generating llms.txt.

[Copilot]

Pull Request Overview

This PR adds a new tutorial on generating an llms.txt file for the DSPy repository and updates the site navigation to include it under a “Real-World Examples” section.

• Introduce a “Real-World Examples” nav group in mkdocs.yml
• Add a detailed llms_txt_generation/index.md tutorial demonstrating end-to-end llms.txt generation

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
docs/mkdocs.yml	Added “Real-World Examples” section linking to the llms.txt tutorial
docs/docs/tutorials/llms_txt_generation/index.md	New tutorial file with step-by-step code for llms.txt generation

Comments suppressed due to low confidence (1)

docs/mkdocs.yml:62

• Indentation for the new nav entries is inconsistent with the surrounding items; align it to match existing levels so the YAML structure remains valid.

        - Real-World Examples: