Extract independent MIT Mortar kit and contribution workflow

vite.config.ts

@@ -0,0 +1,9 @@
+import { defineConfig } from "vite";
+import react from "@vitejs/plugin-react";
+import tailwindcss from "@tailwindcss/vite";
+export default defineConfig({
+  root: "playground",
+  plugins: [react(), tailwindcss()],
+  build: { outDir: "../playground-dist", emptyOutDir: true },
+  server: { port: 4340, strictPort: true },
+});