Samples folder + Models update (From Phi 3.5 -> Gpt 5)

[PabloNunes]

Some significant updates to the organization and references of sample code throughout the documentation, aligning all sample paths under a unified samples directory.

Documentation and Reference Updates:

• Updated all sample code references in markdown files to point to the new samples directory instead of the previous src locations. This affects links for code samples, instructions, and notes across multiple lessons, ensuring consistency and reducing confusion for users following along with the documentation.

Sample Code Correction:

• Updated the model name in the code sample for chat completions from "Phi-3.5-MoE-instruct" to "openai/gpt-5-mini" for accuracy and consistency with available models.

[github-actions]

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