All requestInit arguments could have been undefined already, because we
declared it as an optional argument, but sometimes it’s nice to
explicitly skip the argument with `undefined` which is now possible as
well.

Sometimes we don’t have a static list of choices but an async source for
them (like an API endpoint). This is now supported out of the box
through the searchProvider prop.

refs #185

refs #185

Bootstrap only displays form group errors if the .invalid-feedback
element is preceded by a .is-invalid element. That is an uncessary
restriction and we can simply enforce the errors to be displayed if it
is rendered.

refs #181

Feat rennovate

See merge request !15

ADD: nginx Dockerfile

See merge request !14