This commit changes the way content is handled in the Keystatic package. It introduces rendering the content to HTML in the Keystatic client rather than in the content renderer component. This simplifies the rendering processing and better utilises the properties of the Markdoc library.
The commit updates the way 'Markdoc' is imported in the Keystatic content renderer. It also introduces type checks for imports in the core renderer package. For better error handling, a console.error message has been added for unknown CMS client types.
The commit introduces the '@markdoc/markdoc' library to the Keystatic CMS. It modifies related functions and components such as 'KeystaticDocumentRenderer' and 'keystatic-client' to transform and render content using Markdoc. Additionally, the commit refactors 'keystatic.config.ts' file for more legible content field setup and adds related dependencies in the package.