[Serverless] Add architecture content #818
Description
Description
The Serverless Docs lack architecture information and Support sometimes link customers to the main Elasticsearch guide, which talks about a wide range of things from node discovery, cluster formation to shard allocation, many of which are not relevant to Serverless users.
Suggestions
Our main architecture guide is currently a blog post (+ blog post 2. We may want to cross link or move some of that content into documentation.