CLI: location check can be done earlier

When a CLI command needs to be run from a specific folder, that can be the first thing to check. 

<img width="650" alt="Image" src="https://github.com/user-attachments/assets/2714325b-6af6-4b1b-a165-8fd39333ac1c" />

For example, in the case above, it is more natural if a `ERROR: this command needs to be run from the git-mastery home folder` was the shown first and the command was aborted.
