GUI v2: Alert popup

[apyrgio]

Main issue: #885

Make our alert popups more sleek, by doing the following:

• Use orange color for the selected action.
• Make borders round
• Make the title bold
• Remove any window decorations
• Make text centered
• Make main window inactive and gray

This design will probably clash in subtle ways with our existing warning messages. We'll comment on what issues arise, and how we can circumvent them.

Design material

Single action

Two actions

[apyrgio]

Docker message

The Docker message in the design material misses the option we give to the user to redo the check. We can either add it, or check for the existence of Docker/Podman every 1s, and then automatically proceed. In any case, we also need to add the following:

• A proper explanation of why Docker is needed
• The error that occured (applicable to the case of missing/corrupted container images)

[DeltaEpsilon19498]

Will a warning message specify that docker is needed for windows or mac but not linux (or windows subsystem for linux)?

[apyrgio]

Definitely, I'll make sure to create an issue for the 0.8.0 release and tackle it there, as it's long overdue. This fix will be orthogonal to the designs we suggest here. Thanks for the reminder!