feat: init @affine/docs (#2849)

apps/docs/vite.config.ts

@@ -0,0 +1,13 @@
+import path from 'node:path';
+import url from 'node:url';
+
+import { vanillaExtractPlugin } from '@vanilla-extract/vite-plugin';
+import { defineConfig } from 'waku/config';
+
+export default defineConfig({
+  root: path.dirname(url.fileURLToPath(import.meta.url)),
+  plugins: [vanillaExtractPlugin()],
+  build: {
+    target: 'esnext',
+  },
+});