Add Docs on Search Mode Diversity Ranking

[CShorten]

What's being changed:

This adds docs for Diversity Ranking in Weaviate's Query Agent Search Mode.

For quick reference:

Blurb

Search supports adding diversity weighting to search result rankings using Maximal Marginal Relevance (MMR). This is enabled by passing a diversity_weight parameter in the range of 0.0 to 1.0. To use diversity ranking with target vectors, set the single target vector that you want to use in the Query Agent's constructor. Diversity ranking is not yet supported with collections using multi-vector embeddings. Diversity ranking will work with multiple collections, unless they are using different embedding models.

The Python and TypeScript examples have been added as well

Type of change:

• Feature or enhancements (non-breaking change to add functionality)

How has this been tested?

• Local build - the site works as expected when running yarn start

[orca-security-eu]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   0   0   0	View in Orca
Passed	SAST	0   0   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca