feat(docs): add example of a small form with an ol to which you can add items

inspired by
```
{
id: "items",
component: "ol",
span: true,
evaluatedProps: ["showCondition", "slot"],
showCondition: (val: any[]) => isFullArray(val),
defaultValue: () => [],
slot: (val: any[]) =>
val.map(name => ({
component: "li",
slot: name,
}))
},
```