DNS remarks + bootstrapping

The graph ( https://code.europa.eu/digit-c4/bubble/-/blob/sys_dependencies/docs/sequence/boostrap_bubble/bootstrap_bubble.svg?ref_type=heads ) showcases the setup of the bubble.

The only mention of the DNS in the graph is the bootstrapping of the DNS using Bind as a DNS Resolver without any Netbox connection.

According to @houinbe the graph should demonstrate how to create a Bubble from A to Z so that no further operation is needed.

The graph does not mention the part where DNS should be installed in 'non bootstrap' mode, meaning that it will use Netbox as a source of truth.
This part should be added.

Also it would be great to have customers mention the DNS zones that should be created (intracloud / webcloud).