Fix/docs root

[leo-gan]

No description provided.

[gemini-code-assist]

Code Review

This pull request reorganizes the documentation structure by renaming sections, updating navigation links, and introducing a new benchmark landing page. Key changes include removing header numbering and refining terminology across the C#, Python, and theory guides. Review feedback identifies an inconsistency in the reported number of Python libraries, a grammatical error in the theory section where 'Span' was omitted, and a duplicate description for the Selection Guide entry.

[gemini-code-assist]

The reference to Span seems to have been accidentally removed, leaving the sentence grammatically incomplete ('e.g., C#'s'). It's better to keep the specific example for clarity.

Suggested change

	* **The Solution:** Modern serializers utilize **Zero-Allocation** techniques. They deserialize directly into pre-allocated buffers or use span-like structures (e.g., C#'s) to reference existing memory rather than copying it.
	* **The Solution:** Modern serializers utilize **Zero-Allocation** techniques. They deserialize directly into pre-allocated buffers or use span-like structures (e.g., C# Span<T>) to reference existing memory rather than copying it.