feat(nuxt-module): auto inject `lib/utils` & refresh the playground

This PR is an initial step to improve the nuxt module for shadcn-vue. Huge thanks to https://github.com/ineshbose for helping me out!

Injected lib/utils by the module into buildDir. Now the CLI don't need to inject this file in Nuxt projects, making the file tree more cleaner. An alias for @/lib/utils is created to point the injected file for backward compatibility. Also a soft warning is displayed if a lib/utils file is found in the root and recommends to remove it as it's redundant.
Bumped deps (Notably @nuxt/module-builder which resolves an harmless but annoying warning)

Fixed the issue of tailwindcss classes not applied because nuxtjs/tailwindcss was installed but not added to playground's modules
Generated missing tailwind.css by the CLI
Bumped Button component by the CLI
Refreshed the playground style as it was really dull to me and added a dark mode switch (with tailwindcss and radix-vue/icons which are already dependencies)

Before After

I'll create an issue for those to discuss them first

Resolve this https://github.com/radix-vue/shadcn-vue/issues/271 by passing the components.json options to the module then reading them from the CLI when in a Nuxt project
Auto install & configure nuxtjs/tailwindcss module
Auto install & configure nuxtjs/color-mode module

radix-vue / shadcn-vue