fix: fix entry point for storybook, add storybook static ouput to gitignore

[crebelskydico]

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

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

[ijjk]

Allow CI Workflow Run

• [x] approve CI run for commit: d48e9ef481d442262e8f1fdc7ace5c50bd7855ca

Note: this should only be enabled once the PR is ready to go and can only be enabled by a maintainer

[devjiwonchoi]

Thank you for the PR!