Page edit dialog#626

Page edit dialog would be great like we did before as create dialog.

This is great for simple page forms. For example; a product variant with only price and stock fields.

So no need to redirect to page form view. Just open dialog to edit the model.

title: Product

create:
  title:
    label: Product name
  fields:
    - price
    - stock
  redirect: false
  status: listed

edit:
  title:
    label: Product name
  slug: false
  fields:
    - price
    - stock

Related: https://kirby.nolt.io/627