Documentation not finished

The documentation needs to be finished and the following tasks are open:

• Example for distributed 2D version
• Example for step-by-step version
• Check and update docstrings for:
  • 1D version main function
  • 2D version main function
  • core module public functions
  • utils module public functions
  • visualization module
• Installation Instructions
• Adapt contribution guide
• Move Changelog to a dedicated file and do not link to gitlab releases anymore