Update quickstart CLI reference, expose routes flag

[gfscott]

This PR does three things:

1. Updates the --quickstart description. This was previously handled in plain markdown in the docs but with the new reference generated by the manifest it needs to be directly in the codebase;
2. Un-hides the --routes flag for init. Not clear to me why it was hidden in the first place;
3. Hides the --styling flag, which is no longer supported.

[github-actions]

We detected some changes in packages/*/package.json or packages/*/src, and there are no updates in the .changeset.
If the changes are user-facing and should cause a version bump, run npm run changeset add to track your changes and include them in the next release CHANGELOG.
If you are making simple updates to examples or documentation, you do not need to add a changeset.

[frandiox]

I think it was hidden because nobody asked for it. I added it for my own testing but didn't double check on flag name, etc. But I think it's OK 😅

[gfscott]

Yeah, in this case I'd like to make it public so that what's happening under the hood with --quickstart is documented.

[frandiox]

You'll need to run npm run build in the CLI directory to update oclif.manifest.json

[shopify]

Oxygen deployed a preview of your quickstart-describe branch. Details:

Storefront	Status	Preview link	Deployment details	Last update (UTC)
subscriptions	✅ Successful (Logs)	Preview deployment	Inspect deployment	April 16, 2024 4:57 PM
custom-cart-method	✅ Successful (Logs)	Preview deployment	Inspect deployment	April 16, 2024 4:57 PM
third-party-queries-caching	✅ Successful (Logs)	Preview deployment	Inspect deployment	April 16, 2024 4:57 PM
optimistic-cart-ui	✅ Successful (Logs)	Preview deployment	Inspect deployment	April 16, 2024 4:57 PM
vite	✅ Successful (Logs)	Preview deployment	Inspect deployment	April 16, 2024 4:57 PM
skeleton	✅ Successful (Logs)	Preview deployment	Inspect deployment	April 16, 2024 4:57 PM

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