resolves #4

packages for testing: create-spicetify-app, spicetify-creator

Changelog

General:

• bumped dependencies
• switched from yarn to pnpm
• added prettier
• made both packages pure es modules
• refactored, optimized a little bit and cleaned up the code

Spicetify Creator:

• improved monorepos support
• switched from uglify-js & clean-css to esbuild for css/js minification
• switched from esbuild-plugin-postcss2 to esbuild-style-plugin
• updated types to account custom apps name localization
• added esbuild-plugin-inline-import

Create Spicetify app

• added pnpm support
• set react types version to 17.0.2 (used in Spotify v1.2.0-1.2.26)
• updated the template's tsconfig.json
• added update:spicetify-types npm script to the template package.json
• renamed build-local script to build
• renamed build script to build:local
• updated templates code

BREAKING CHANGE

Since esbuild-plugin-postcss2 has been replaced with esbuild-style-plugin all style imports need to be updated to use relative paths, otherwise you will get an error like this [plugin esbuild-style-plugin] Could not resolve "css/app.module.scss" during the compilation