Adds some notes about authoring vs rendering.

_config.yml

@@ -9,6 +9,8 @@ logo: "/assets/images/structurizr-banner.png"
 favicon_ico: "/assets/images/favicon.ico"
 
 nav_external_links:
+ - title: Open JSON data format
+ url: https://github.com/structurizr/json
  - title: Examples
  url: https://github.com/structurizr/examples
  - title: C4 model

index.md

@@ -11,8 +11,18 @@ permalink: /
 Structurizr builds upon "diagrams as code", allowing you to create
 __multiple software architecture diagrams__, in a __variety of rendering tools__, from a __single model__.
 
-The Structurizr tooling is available in a number of versions, covering different usage scenarios.
+## Authoring vs rendering
+
+In Structurizr, a __workspace__ is the wrapper for your software architecture model, views, and supplementary documentation.
+Unlike most modelling tools, Structurizr separates workspace authoring from workspace rendering via its
+[open JSON data format](https://github.com/structurizr/json).
+
+![](images/authoring-vs-rendering.png)
+
+## Which product?
 
+The Structurizr tooling is available in a number of versions, covering different usage scenarios.
+Many [community tools](/community) are also available.
 
 | Product | Description | License |
 |-----------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|
@@ -21,8 +31,6 @@ The Structurizr tooling is available in a number of versions, covering different
 | [Structurizr cloud service](/cloud) | The Structurizr cloud service, providing a way to publish diagrams, documentation, and architecture decision records. | Free and paid |
 | [Structurizr CLI](/cli) | A command line utility designed to be used in conjunction with the Structurizr DSL, supporting pull/push via the web API and exports to a number of formats including PlantUML and Mermaid. | Open source |
 
-## Which product?
-
 The Structurizr tooling encourages the adoption of a "diagrams and documentation as code" approach,
 with everything being stored in source code control.
 So, with that in mind, the easiest way to get started with Structurizr is to use the Structurizr DSL in combination