Cache stores page is out of date

https://infinispan.org/cache-store-implementations/

- "Core Cache Stores" -> "Cache Stores"
- "Most of these cache stores are included in the infinispan-embedded JAR". - Drop.
- "Extra Cache Stores" section is stale.
- Docu links need to be updated.

Open the cache-store implementations page at infinispan.org/cache-store-implementations/ and compare its headings, cache-store descriptions, and links with the current project information. Rename “Core Cache Stores” to “Cache Stores,” remove the outdated embedded JAR statement, refresh the “Extra Cache Stores” section, and update the documentation links.

Written by the indexing model from the issue text.