Document Default Content

Problem/Motivation

We have a stub for it in the README, and touch on it in https://git.drupalcode.org/project/distributions_recipes/-/blob/1.0.x/do...

But we should provide more in depth documentation, and a roadmap.

We can use https://kanopi.com/blog/default-content-in-drupal/ as an example.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes