Add confirmation dialog when Removing column

[montogeek]

Hi!

At this moment when you click the X icon, it does not show a confirmation.
A basic confirmation alert/message would be nice.

[zenorocha]

+1

[murielsilveira]

👍

[AdrianoCahete]

Some users can think popup is annoying, so some other options:

• Leave without confirmation, but put a "undo" link (like GMail with a new mail);
• Change a "delete" definition to "archive". You can archive some column and, if it's a misktake, you can "unarchive" from archive panel.

[montogeek]

@AdrianoCahete I like your second idea :) It is related to this idea devspace/devspace#45

[zenorocha]

I think I prefer this undo idea. Thanks for sharing @AdrianoCahete