Updated default templates inline with create-cloudflare

[timReynolds]

Fixes #427 by updating the default templates to align with those in the create-cloudflare experimental templates.

Please let me know if there is anything else I need to provide for this to be merged.

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[vicb]

defineCloudflareConfig is what we want.

We should update c3 to use that.

[vicb]

Thanks for the PR.

We should change to use .jsonc (across the repo) but we definitely want to use the helper to simplify the config

/cc @dario-piotrowicz

Edit: see #429