Update to Camunda Modeler @next infrastructure

[nikku]

This issue tracks the progress of updating the Zeebe Modeler to the upcoming Camunda Modeler @next foundations.

Context

Hi @dominikhrn. First of all, thank you for maintaining the Zeebe Modeler 👏.

In the Camunda Modeling sphere we are working hard on the next version of our modeler foundation. You may follow the progress here. The new foundation applies numerous under-the-hood improvements, including:

• improved client app maintainability and extensibility by making it a react application
• improved client/backend communication and separation of responsibilities
• efficiently build the client application, resulting in better responsiveness of the application
• improved testing and code coverage
• improved release builds

The overall goal we aim to achieve is simpler maintenance and readiness for future extensions.

Road Forward

We plan to contribute the infrastructure improvements implemented in Camunda Modeler @next to this project once we reached our 3.0.0-0 target.

Tasks

• Update to Camunda Modeler @next
• Add automated release and nightly builds (Add CI integration and release builds #6)
• Add / Improve test infrastructure (Setup testing #4)
• Improve user documentation (focus on README for now, Add modeler screenshot #35)
• Setup and document a way to keep up-to-date with upstream Camunda Modeler

Stay tuned for pull requests that contribute the changes 🚀.

[nikku]

From my point of view this issue can be closed. 🚗

[menski]

Big thanks to everyone involved that was impressive progress 👏