Update documentation opening to introduce the Lucene/Elasticsearch option

Description

The tagline of the Hibernate Search project has been "Apache Lucene integration" - at least in the reference documentation.

Since we're widening the scope of integrations, we need to update these. updated the README, the documentation needs to see a similar reorganization; in particular the opening paragraphs.

Environment

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Assignee

Sanne Grinovero

Reporter

Sanne Grinovero

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Blocker
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