[DOCS] Add Elastic Rerank usage docs

[leemthompo]

https://github.com/elastic/search-team/issues/8757

Updates:

• Elasticsearch Service page of Inference API
  • 👀 URL preview
• Semantic re-ranking overview page
  • 👀 URL preview
• The text-similarity-retriever retriever APIs under Search API
  • 👀URL preview

Makes Elastic Rerank the go-to default choice for re-ranking use cases.

Follow up

• [ ] Update ML docs to create an "Elastic Rerank" model landing page with requirements, callouts, benchmarks, etc. in the built-in models section
• [ ] Python notebook

[github-actions[bot]]

Documentation preview:

• ✨ Changed pages

[elasticsearchmachine]

Pinging @elastic/es-docs (Team:Docs)

[elasticsearchmachine]

💚 Backport successful

Status	Branch	Result
✅	8.17
✅	8.x