Update architecture diagrams for Cheshire Cat

https://docs.couchbase.com/server/7.0/learn/services-and-indexes/services/query-service.html

This page has a figure showing index as GSI, other pages has index service. Doesn’t explain/point to GSI/index properly. What is the standard?

• Rename GSI as Index in the diagram. Make sure that all diagram sources are available and stored with the documentation source.

Query execution figure is out of date.  The query can use data, gsi and search.

• Update diagram to include FTS. As above, find diagram source and make available with the documentation source.

https://docs.couchbase.com/server/7.0/learn/services-and-indexes/services/index-service.html

Why does this figure show buckets and not collections?

• Add collections as subdivisions of buckets in the diagram.