Improve init --site error for existing wrangler.toml

[exvuma]

💡 Feature request

For wrangler init --site if wrangler.toml exists already instead of erroring, make the worker-site directory and ask the user to append to their wrangler.toml bucket and entry-point

Basic example

Instead of:

this-wrangler init --site
Error: A wrangler.toml file already exists! Please remove it before running this command again.

output

this-wrangler init --site
⬇️ Installing cargo-generate...
⚠️ Append to the parent environment in your wrangler.toml:
[site]
bucket = "./static-folder"
entry-point = "workers-site"
🌀  🐑  Generating a new webpack worker project with name 'workers-site'...
🔧   Creating project called `workers-site`...
✨   Done! New project created /Users/victoriabernard/cf-github/workers-docs/workers-site

Nit: Succesfully should be spelled Successfully while we at it

[ashleygwilliams]

so the trick with this is that we don't know what the user's static file directory is called. i can make a PR to improve the message tho- let me see what i can come up with