introduce additional diagram types

[sebastian-sommerfeld-io]

This pull request introduces support for rendering and previewing various types of diagrams through integration with a Kroki instance. The following diagram types are now supported:

• https://github.com/sommerfeld-io/krokidile/issues/71: Diagrams Through Ascii Art
• https://github.com/sommerfeld-io/krokidile/issues/60: Block diagrams
• https://github.com/sommerfeld-io/krokidile/issues/72: Entity-Relationship diagrams
• https://github.com/sommerfeld-io/krokidile/issues/67: Rack diagrams
• https://github.com/sommerfeld-io/krokidile/issues/75: Diagrams and visualizations with Markdown-like syntax
• https://github.com/sommerfeld-io/krokidile/issues/78: C4 model diagrams for software architecture

Features

• Rendering and Previewing:
  • For each diagram type, the code is sent to a Kroki instance.
  • The rendered diagrams are previewed as images directly within the application interface.
• Download Support:
  • Users can download the source code for each diagram type.
  • Users can also download the rendered images of the diagrams.

The integration ensures that users can easily create, preview, and download both the code and the resulting images of the diagrams, enhancing the overall user experience and productivity in diagram creation and management.

[sebastian-sommerfeld-io]

:tada: This PR is included in version 0.8.0 :tada:

The release is available on GitHub release

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