Structurizr integration

[erikhofer]

Structurizr is a very great tool for creating architecture diagrams. We should make an effort to integrate with it. There are multiple angles at which we can approach this.

• Use exported diagrams. This would be possible for mermaid with Embed code from file #210
• Embed live diagrams of Structurizr Lite. This could work similar to how Structurizr does this itself https://structurizr.com/help/documentation/diagrams. See https://structurizr.com/help/embed-iframe
• Make docs exportable to Structurizr, see https://github.com/structurizr/dsl/blob/master/docs/language-reference.md#documentation
• Importer for Structurizr ADRs (maybe also exporter?)