Fix example on how to add DKRZ Gitlab as remote

* Use the SSH protocol
* Be more verbose on additional steps (creating/uploading key)

lectures/git/slides.qmd

@@ -337,14 +337,16 @@ GitLab can act as a remote (like Github or even a local copy could also).
 
 ## Hands-on session {background-color=var(--dark-bg-color) .leftalign}
 
-1. Upload your public SSH key to the DKRZ GitLab
+1. Create a new SSH Key pair (`ssh-keygen`) to use with Gitlab
+1. Login to [DKRZ GitLab](https://gitlab.dkrz.de) and upload your public SSH key
+1. Configure your SSH client to use the right private key for the host `gitlab.dkrz.de`
 2. Push your repository to GitLab
 3. Create a branch and add a new file
 4. Create a merge request  (add author, reviewer, ...)
 5. Approve and merge it to `main`
 
 :::{.info .tiny}
-https://gitlab.dkrz.de/generic-software-skills/students2024/\<YOUR_USERNAME\>.git
+git@gitlab.dkrz.de:generic-software-skills/students2024/\<YOUR_USERNAME\>.git
 :::
 
 ## Take home messages