fix: fix entry point for storybook, add storybook static ouput to gitignore (#67207)

This PR will fix https://github.com/vercel/next.js/issues/67206

- [x] contributing guidelines for examples are followed
- [x] lint runs without errors

examples/with-storybook/.gitignore

@@ -35,4 +35,6 @@ yarn-error.log*
 *.tsbuildinfo
 next-env.d.ts
 
-*storybook.log
+# storybook
+*storybook.log
+/storybook-static

examples/with-storybook/.storybook/main.ts

@@ -1,7 +1,10 @@
 import type { StorybookConfig } from "@storybook/nextjs";
 
 const config: StorybookConfig = {
-  stories: ["../src/**/*.mdx", "../src/**/*.stories.@(js|jsx|mjs|ts|tsx)"],
+  stories: [
+    "../stories/**/*.mdx",
+    "../stories/**/*.stories.@(js|jsx|mjs|ts|tsx)",
+  ],
   addons: [
     "@storybook/addon-links",
     "@storybook/addon-essentials",