Release 0.31.0

Changelog

• added an option to set a namespace prefix for the internal scope
  • lets you combine models from different sources/projects
  • overrides the :external key in the model and views
• views with :external set to true are not rendered
• fixed model-api calls for organization navigation
• added relative link functions to markdown api
• enhanced documentation templates
• added a deps.edn file
• updated dependencies
• added best practices topic