Fix math and indents on conceptual code groupings

This document covers writing code for and contributing configuration to Drutopia features and the Drutopia distribution.

Drutopia so far consists of four bodies of code:

Drutopia code can be divided into five groups:

* [Drupal 9 core](https://www.drupal.org/project/drupal).

* Drutopia install profile (drutopia).