Customer Admin UI Logo Example is broken

in the readme.md file [here](https://github.com/keystonejs/keystone/tree/main/examples/custom-admin-ui-logo) it seems that the code sandbox [example](https://githubbox.com/keystonejs/keystone/tree/main/examples/custom-admin-ui-logo) is broken due to the following error:

```
✨ Starting Keystone
✘ [ERROR] Could not resolve "../example-utils"

keystone.ts:2:30:
2 │ import { fixPrismaPath } from '../example-utils';
╵ ~~~~~~~~~~~~~~~~~~

Error: Cannot find module '/project/sandbox/.keystone/config.js'
Require stack:
- /project/sandbox/node_modules/@keystone-6/core/dist/artifacts-ad26eee3.cjs.dev.js
- /project/sandbox/node_modules/@keystone-6/core/scripts/cli/dist/keystone-6-core-scripts-cli.cjs.dev.js
- /project/sandbox/node_modules/@keystone-6/core/scripts/dist/keystone-6-core-scripts.cjs.dev.js
- /project/sandbox/node_modules/@keystone-6/core/scripts/dist/keystone-6-core-scripts.cjs.js
- /project/sandbox/node_modules/@keystone-6/core/bin/cli.js
at Function.Module._resolveFilename (node:internal/modules/cjs/loader:956:15)
at /project/sandbox/node_modules/next/dist/server/require-hook.js:110:36
at Function.Module._load (node:internal/modules/cjs/loader:804:27)
at Module.require (node:internal/modules/cjs/loader:1028:19)
at require (node:internal/modules/cjs/helpers:102:18)
at Object.getBuiltKeystoneConfiguration (/project/sandbox/node_modules/@keystone-6/core/dist/artifacts-ad26eee3.cjs.dev.js:365:28)
at dev (/project/sandbox/node_modules/@keystone-6/core/scripts/cli/dist/keystone-6-core-scripts-cli.cjs.dev.js:886:42)
at processTicksAndRejections (node:internal/process/task_queues:96:5) {
code: 'MODULE_NOT_FOUND',
requireStack: [
'/project/sandbox/node_modules/@keystone-6/core/dist/artifacts-ad26eee3.cjs.dev.js',
'/project/sandbox/node_modules/@keystone-6/core/scripts/cli/dist/keystone-6-core-scripts-cli.cjs.dev.js',
'/project/sandbox/node_modules/@keystone-6/core/scripts/dist/keystone-6-core-scripts.cjs.dev.js',
'/project/sandbox/node_modules/@keystone-6/core/scripts/dist/keystone-6-core-scripts.cjs.js',
'/project/sandbox/node_modules/@keystone-6/core/bin/cli.js'
]
}
error Command failed with exit code 1.
```

Start with README.md and the examples/custom-admin-ui-logo CodeSandbox link, then inspect its keystone.ts import of ../example-utils. Verify how the example is packaged and started; done means the sandbox resolves the helper and starts Keystone without the missing config.js error.

Written by the indexing model from the issue text.