Add Netlify friendly demo build process

Author: weotch

packages/react/netlify.toml

@@ -0,0 +1,6 @@
+[build]
+command = "yarn demo:build"
+publish = "dist"
+
+[build.environment]
+NODE_VERSION = "18"

packages/react/package.json

@@ -14,7 +14,8 @@
     "build": "vite build",
     "test": "cypress run --component",
     "typecheck": "tsc --noEmit",
-    "demo": "vite --config vite.demo.config.ts"
+    "demo": "vite --config vite.demo.config.ts",
+    "demo:build": "vite build --config vite.demo.config.ts"
   },
   "dependencies": {
     "@react-hook/media-query": "^1.1.1",

packages/react/vite.demo.config.ts

@@ -5,8 +5,13 @@ import react from "@vitejs/plugin-react";
 export default defineConfig({
   plugins: [react()],
   root: "demo",
+  base: "./",
   server: {
     port: 3000,
     open: true,
   },
+  build: {
+    outDir: "../dist",
+    emptyOutDir: true,
+  },
 });