Do not run "config pull" unless project initialized

[lectrician1]

Proposal:
The command nhost config pull should not be run if an nhost folder does not exist in the project directory and should prompt the user to run nhost init --remote first.

Reason:
I linked a Nhost cloud project with my GitHub project and it provides a warning on the website to run nhost config pull to get the most recent settings. I ran this but it only created my nhost directory and .toml file and did not pull migrations which I thought it would do. Furthermore I didn't realize init was for existing projects too and thought it was only for initializing projects.

Relevant Discord discussion: https://discord.com/channels/552499021260914688/1211357972291387473

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.