Guide users to using kio-admin instead of sudo

This commit adds a guided setup that leads users from a situation in which they try to "sudo dolphin" towards them successfully setting up and using kio-admin.

1. When users enter "sudo dolphin", they are told to start Dolphin by typing "dolphin --sudo" or "dolphin --admin" instead.
2. When Dolphin is started with "--sudo" or "--admin" it checks whether an "admin" protocol is installed. If not, a guided setup leads users towards installing it.
3. After that, Dolphin starts with an installed "admin" protocol like kio-admin. Now a non-modal information dialog appears that explains how to activate and use kio-admin.

Updated video with the latest changes:

output

Outdated video without the latest changes which also contains my barely pronounced and at times incomprehensible explanations (Hadn't uttered English sounds in months):

2024-05-14_17-01-42