Tutorial: Building an app with Preact CLI

Now that Preact CLI is listed over on the PWA page, it would be 💯 to give developers a clean walk-through they can follow for building their first app using Preact CLI.

A tutorial could replicate building the Weather PWA with Preact CLI or something quite different if we need an app that is more complex, like something using the Hacker News or Wikipedia APIs.

Draft task list:

• Decide on the app the tutorial would help you build
• Decide if the tutorial will cover deploying H/2 Server Push (Firebase static hosting?)
• Write the app we will show developers how to build and validate it's suitable for the tutorial
• Draft tutorial. Show folks how to validate features + performance are ✔️ using Lighthouse ⚡️
• Review (perhaps have some Preact community members try it out?) 🤔
• Ship it! 🚢

Looping in some folks for their thoughts: @lukeed @kristoferbaxter