create-earthling-app cli

Responsibilities of template creation

1. Remove hello world assets/stylings from base template
   1. public/*
   2. src/app/page.tsx stuff
2. install tailwind
   1. make sure postcss.config.mjs is there/working with the tailwind plugin
3. install shadcn / earthling-ui
   1. Move cn from lib/utils to utils/cn.tsx
   2. change fonts to css variables
4. add svg support
5. flex-col body and make window height (min-[100svh])
6. set up vars.tsx
7. set up store?