Cosmetic Fixes Follow-Up

[tobias-weber]

This PR is a follow-up for #106.
See also the related Polypheny-DB PR.

Changes

• Notebooks
  • fix issues with sidebar staying empty
  • fix restart of notebooks and container
  • fix issue where the web socket randomly loses the connection
  • use consistent trash icon for deleting cells
  • show Docker instance name in dashboard
• Workflows
  • add more Workflow API endpoints
  • Improve visuals of the activity help in the left menu
  • Avoid selection of UI elements when dragging nodes
• Data View
  • Add button to abort editing
  • Editing now also stops when switching entities
• Toasts
  • Enabled and improved look and feel of query copy button

[datomo]

Thx @tobias-weber for all these cosmetic fixes, looks good to me.