enhance: move PostCSS config to package.json for better Windows compatibility

- For Windows users, if the path to the project contains spaces, the PostCSS configuration must be placed within the package.json file to ensure proper functionality.
- Fixes #150 issue.

exampleSite/postcss.config.js

@@ -1,6 +0,0 @@
-module.exports = {
-  plugins: {
-    tailwindcss: {},
-    autoprefixer: {},
-  },
-};