Add information about using DDEV for local development

Documentation location/URL

We could add a recommendation to use DDEV for local development in the User Guide.

Would it make sense to add it as a new "3.1" item, squeezing it in right before "Concept: Server Requirements" like this? (changing "3.1 Concept: Server Requirements" to "3.2")

• 3.1 Concept: Local development
• 3.2 Concept: Server Requirements

https://www.drupal.org/docs/user_guide/en/installation-chapter.html →

Problem/Motivation

Since DDEV is now the recommended local development tool, it would be nice to highlight this in the User Guide.

Proposed resolution

Add the content from https://www.drupal.org/docs/official_docs/local-development-guide → in the User Guide, as a new "3.1 Concept: Local development" chapter.

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