Add to the website homepage references for vector-based and hybrid search

### Description

In the Lucene homepage there's no mention of vector-based search and hybrid capabilities of Apache Lucene.
One of the outcomes of the Birds of a Feather from Community Over Code EU 2024 was that we need to advertise more these powerful functionalities (as most vector-DB do quite well).

No file or test is named in the issue. Start by locating the Lucene website homepage source and review how existing search capabilities are described. Done means the homepage clearly references vector-based search and hybrid search, reflecting the issue's advertising goal.

Written by the indexing model from the issue text.