* Fix local cluster delete flow

- Now checks for the cluster being the current cluster and confirms the
  action

- <ConfirmDialog> is fixed to work with several confirmations happinging
  at once
Signed-off-by: Sebastian Malton <sebastian@malton.name>

* Custom delete cluster dialog
Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

* Saving kubeconfig file refactoring
Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

* Switching current-context from dialog
Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

* Cleaning up css styles
Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

* Show Delete menu item only for local cluster
Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

* Make all dialogs rounded
Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

* Releasing kubeconfig file after lock
Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

* Adding delete...