Recipe authoring documentation should mention publishing to Drupal.org

Problem/Motivation

https://git.drupalcode.org/project/distributions_recipes/-/blob/1.0.x/do... should include a note about publishing recipes to Drupal.org as general projects, since this question comes up frequently, and we want to encourage recipes on Drupal.org so they are findable.

Proposed resolution

If you would like to make your recipe available for other Drupal sites, publish it to Drupal.org. Start by creating a general project at https://www.drupal.org/node/add/project-general →

Remaining tasks

User interface changes

API changes

Data model changes