Use autoprefixer instead of postcss-preset-env (#21215)

I realized while looking over this that the `autoprefixer` plugin isn't being used by postcss because it's not included in the `postcss.config.js`. Additionally, since `postcss-preset-env` doesn't support PostCSS 8 yet, and it includes PostCSS 7 as a dependency, I've removed that package. There is an open issue to add PostCSS 8 support to `postcss-preset-env` [here](csstools/postcss-preset-env#191). @kripod's comments on my other PR #20956 are what prompted me to check this out. On a side note, it looks like all the CMS examples use Tailwind CSS v1 still, so that's something someone (possibly myself) could tackle later.
vercel · Jan 22, 2021 · ded6e24 · ded6e24
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diff --git a/examples/blog-starter-typescript/package.json b/examples/blog-starter-typescript/package.json
@@ -26,7 +26,6 @@
     "@types/react-dom": "^16.9.8",
     "autoprefixer": "^10.2.1",
     "postcss": "^8.2.4",
-    "postcss-preset-env": "^6.7.0",
     "tailwindcss": "^2.0.2"
   },
   "license": "MIT"

diff --git a/examples/blog-starter-typescript/postcss.config.js b/examples/blog-starter-typescript/postcss.config.js
@@ -1,3 +1,3 @@
 module.exports = {
-  plugins: ['tailwindcss', 'postcss-preset-env'],
+  plugins: ['tailwindcss', 'autoprefixer'],
 }
diff --git a/examples/blog-starter/package.json b/examples/blog-starter/package.json
@@ -19,7 +19,6 @@
   "devDependencies": {
     "autoprefixer": "^10.2.1",
     "postcss": "^8.2.4",
-    "postcss-preset-env": "^6.7.0",
     "tailwindcss": "^2.0.2"
   },
   "license": "MIT"

diff --git a/examples/blog-starter/postcss.config.js b/examples/blog-starter/postcss.config.js
@@ -1,3 +1,3 @@
 module.exports = {
-  plugins: ['tailwindcss', 'postcss-preset-env'],
+  plugins: ['tailwindcss', 'autoprefixer'],
 }