Added prompt, if the directory already exists

[ahaywood]

Notion ID: CTL-292

Feature description

Before

With Create Redwood App, if the user specified a directory that already existed, the app would quit.

After

Now, if the directory already exists, then the user is presented with an additional prompt:

<DIRECTORY_NAME> already exists and is not empty. 

How would you like to proceed?
- Overwrite files and continue install
- Specify a different directory
- Quit and install

Screenshot:

---

This was the original PR: #8854

• Some changes were made to Create Redwood App since I last worked on this. It just seemed easier to create a new branch
• I implemented the change requests
  • Bug where the target directory wasn't being listed (Reference)
  • Changed the order of options listed. Quit install is listed first and pre-selected. (Reference)
  • Removed the "You can use the 'overwrite' flag" text (Reference)

[ahaywood]

@Tobbe I implemented the changes you requested. Would you mind taking another look?

[notion-workspace]

Additional prompt, if the directory already exists

[Tobbe]

I tried this locally and I think I found an issue

It seems it's not handling ~ correctly when I use it to specify a new directory, but it worked just fine for the initial directory I specified as an argument

[Tobbe]

This is how it works now:

First I try with a directory that already exists and get prompted for a new path.
I try with ~tobbe/... and get an error, and is again prompted for a new path.
I try with ~/... and that works (thanks to the untilde library that we already used for another prompt in this script)

And just to demonstrate that the ~username syntax works on the command line

And the reason it works there is that it's the shell that does the tilde expansion, and not Node.