Adds a documentation page for Superlinked (SIE) as a Qdrant embedding
provider. The sie-qdrant package provides SIEVectorizer for dense
embeddings and SIENamedVectorizer for multi-type (dense, sparse, and
multivector/ColBERT) embeddings, enabling hybrid search via Qdrant's
Reciprocal Rank Fusion and native MaxSim retrieval via MultiVectorConfig.
Python-only.
