Adding a conditional that invokes a "get stripe dashboard" function i…

[k-thornton]

…f the user is already subscribed, to disallow a second subscription from being created.

Addresses https://github.com/vercel/nextjs-subscription-payments/issues/366

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[k-thornton]

The fact that the maintainers switched the button text between "Manage" and "Subscribe" leads me to believe that invoking the client dashboard was the way this was intended to work.

[leerob]

Thank for you opening a PR to make this example better.

We are sunsetting this example in favor of a newer, more modern SaaS starter example.

You can check it out here -> https://github.com/nextjs/saas-starter