Simple editablecontent form example

[noteed]

In https://hypered.github.io/design-system/nubs-bash/hello/ we have an example form with a header containing a filename and a save button, just above a contenteditable text zone.

I'd like a complete example of such a form in Storybook (just like https://hypered.github.io/design-system/storybook/?path=/story/form--login), maybe with some variation (e.g. the save button put at the bottom).

(The contenteditable component already exists here: https://hypered.github.io/design-system/storybook/?path=/story/code-block--editable)