adds predev for portless to vue/vite (#178)

examples/vite-renderers/package.json

@@ -3,6 +3,7 @@
   "version": "0.1.2",
   "private": true,
   "scripts": {
+    "predev": "command -v portless >/dev/null 2>&1 || (echo '\\nportless is required but not installed. Run: npm i -g portless\\nSee: https://github.com/vercel-labs/portless\\n' && exit 1)",
     "dev": "portless vite-renderers.json-render vite",
     "build": "vite build",
     "preview": "vite preview"

examples/vue/package.json

@@ -3,6 +3,7 @@
   "version": "0.1.2",
   "private": true,
   "scripts": {
+    "predev": "command -v portless >/dev/null 2>&1 || (echo '\\nportless is required but not installed. Run: npm i -g portless\\nSee: https://github.com/vercel-labs/portless\\n' && exit 1)",
     "dev": "portless vue.json-render vite",
     "build": "vite build",
     "preview": "vite preview"