A first repo app

Adds a first boilerplate app (with tailwind) to the repo...

The next time we'll see a minor release is when we can deploy this app as our sample-website.

What's Changed

• Consume spwn 0.35.1 - our first stable open-source package provider by @zpydee in #18
• we appear to be able to add a nextjs app in this repo. by @zpydee in #19

Full Changelog: v0.17.0...v0.18.0