update according to tailwind v4 docs

Author: PatMulligan

apps/www/src/content/docs/installation/vite.md

@@ -28,25 +28,19 @@ npm create vite@latest my-vue-app -- --template vue-ts
 Install `tailwindcss` and its peer dependencies, then generate your `tailwind.config.js` and configure `postcss` plugins
 
   ```bash
-  npm install -D @tailwindcss/vite @tailwindcss/postcss autoprefixer
+  npm install -D tailwindcss @tailwindcss/vite
   ```
 
 #### `vite.config`
 
 ```typescript {2,3,8-12}
 import vue from '@vitejs/plugin-vue'
-import autoprefixer from 'autoprefixer'
 import tailwindcss from '@tailwindcss/vite'
 import { defineConfig } from 'vite'
 
 // https://vite.dev/config/
 export default defineConfig({
-  css: {
-    postcss: {
-      plugins: [tailwindcss(), autoprefixer()],
-    },
-  },
-  plugins: [vue()],
+  plugins: [vue(), tailwindcss()],
 })
 ```
 
@@ -85,18 +79,12 @@ npm i -D @types/node
 ```typescript {1,15-19}
 import { fileURLToPath, URL } from 'node:url'
 import vue from '@vitejs/plugin-vue'
-import autoprefixer from 'autoprefixer'
 import tailwindcss from '@tailwindcss/vite'
 import { defineConfig } from 'vite'
 
 // https://vite.dev/config/
 export default defineConfig({
-  css: {
-    postcss: {
-      plugins: [tailwindcss(), autoprefixer()],
-    },
-  },
-  plugins: [vue()],
+  plugins: [vue(), tailwindcss()],
   resolve: {
     alias: {
       '@': fileURLToPath(new URL('./src', import.meta.url))