More empathetic install script

[SteinRobert]

The install script is pretty cool.

I'd like to suggest to provide the user with some additional information after the script finished successfully. Something along the following lines:

🎉 Getdeck has been successfully installed

➡️  Here's our getting started guide: https://getdeck.dev/docs/deck/getting-started
⚙️  Intro for Ops: https://getdeck.dev/docs/deck/for-devops/intro
💻  Intro for Devs: https://getdeck.dev/docs/deck/for-devs/intro

❓ Any problems? Feel free to provide us with feedback: https://github.com/Getdeck/getdeck/issues/