minify assets in prod

packages/docs/package.json

@@ -6,7 +6,7 @@
     "prepare": "node ./scripts/fix-heroicons.js",
     "serve": "esmo --experimental-import-meta-resolve --experimental-json-modules --no-warnings --enable-source-maps src/main.tsx | pino-colada",
     "dev": "nodemon --inspect --exec \"pnpm serve\" --watch src --ext ts,tsx,md,css",
-    "start": "NODE_ENV=production pnpm serve",
+    "start": "cross-env NODE_ENV=production pnpm serve",
     "typecheck": "tsc --noEmit"
   },
   "dependencies": {
@@ -15,6 +15,8 @@
     "alpinejs": "^3.7.1",
     "clsx": "^1.1.1",
     "compression": "^1.7.4",
+    "cross-env": "^7.0.3",
+    "cssnano": "^5.0.15",
     "esbuild": "^0.14.10",
     "esno": "^0.13.0",
     "express": "^4.17.2",
@@ -36,6 +38,7 @@
   "devDependencies": {
     "@types/browser-sync": "^2.26.3",
     "@types/compression": "^1.7.2",
+    "@types/cssnano": "^5.0.0",
     "@types/express": "^4.17.13",
     "@types/markdown-it": "^12.2.3",
     "@types/node": "*",