### Context

Storybook docs are now up for the Date picker. They are missing code examples.

I've indicated where these examples need to be added with:

```markdown
> **Example**: lorem ipsum
```

### To do:

Add example code for:

* [ ] Common elements
* [ ] Begin of the insertion~~WorkEnd of the insertion Begin of the deletion WorkEnd of the deletion package date Begin of the insertionpicker~~ (removed, as we will remove that component from Storybook all together) End of the insertion Begin of the deletion pickerEnd of the deletion
* [ ] Begin of the insertion~~ModalEnd of the insertion Begin of the deletion ModalEnd of the deletion date Begin of the insertionpicker~~ (I want to discuss the re-usability of the component first \[WL\])End of the insertion Begin of the deletion pickerEnd of the deletion
* [ ] Basic date picker

### Pull request

https://github.com/opf/openproject/pull/12018