Docs: add example listing of all form components available out of the box

[adrianschmidt]

New feature motivation

This was indirectly requested by @DavidAkkerman on the forum:

Hi, we love the limel-form, which makes many things so much easier :smiley:

However, sometimes it can be tricky to find out what possibilities there are for standard form types/formats. There are many great examples in the documentation but we can’t really find an easy overview list. This sometimes results in either long search times, or worse even, in redoing a component that already exists as a standard. Is there somewhere we could find this?

New feature description

I don't know if there's anything else to describe really… 🤔 This isn't a new feature, just some new documentation…

New feature implementation

Off the top of my head, I'm thinking we add an example that showcases all the form components or field types that are supported without the consumer having to add their own custom form components, and we clearly state that this is the purpose of the example, and what type each field is.