Add recipe for Vegan Milk Chocolate to Umami

Problem/Motivation

#2939908: Add an article to Umami - Dairy-free chocolate → was proposed to add an article about Dairy Free Chocolate to the Umami demo. This article contained a recipe at the end. This should not be contained in the article itself but a separate Recipe node in its own right.

This issue is a follow on to create the Recipe node.

Proposed resolution

Take the article as proposed in https://www.drupal.org/project/drupal/issues/2939908#comment-12774442 → , and create a standalone recipe from the base of the new article it adds. Reuse the image from the article for the recipe.

Remaining tasks

All the things.

User interface changes

None.

API changes

None.

Data model changes

None.