Do not create new branch after `shelly setup`.

[#55915688]
Consistent output for `shelly setup`.

* print 'Your application is set up.' message after `shelly setup`
  if user do not overwrite the remote
* show correct remote name in 'git fetch' message if user overwrite
  the remote

[#56455818]
Merge pull request #104 from shellycloud/55915688-do-not-create-extra-branch-after-shelly-setup

Improvements in shelly setup command