* doc: change tutorial git to suggest HTTPS
Since we're instructing the user to create a new repository, it might be a safe bet to assume that they don't have their SSH keys set up. HTTPS might be a better option in this context.
* docs: keep ssh add https
@Hongarc said, "How about keep `SSH` and add `HTTPS`." This is one way to do that.
* Update tutorial-setup.md