Starter to use imported react-imported-component with rollup

WIP

Architecture

• Use esm in both client side & server side
• Use preact via --experimental-loader=./loader.js

Entrypoints

• entries/client.tsx bundle app for the browser
• entries/server.ts bundle the app that can be used in server
• server.js to start the app in server

Getting starter

npm run build to build dist

npm run dev:server to start the app in server