Missing input types in documentation

[pschaub]

Some input types are not shown in the documentation, e.g. date.
See: https://db-ui.github.io/core/?p=viewall-elements-input

Especially types like date are interesting because they show an icon next to the input field.

List of HTML5 input types:
https://www.w3.org/TR/2011/WD-html5-20110525/the-input-element.html#attr-input-type

[mfranzke]

The main reason for this is that we've deactivated some older 1.6 styles that we still provide, but haven't been reworked with version 2 of the guidelines. We've already planned to provide an additional rendering of those as well, and I will follow up on this task.