Add Evaluation Board template + EVAL-AD4052-ARDZ

[gastmaier]

Adds the evaluation board EVAL-AD4052-ARDZ user guide and template built from it.
Also:

• Use toctree glob for evals
• Minor fixess
• Organize eval in category folders
• Move adrv9026 to transceiver folder

The reasoning for this structure is that it allows to generate custom user guides, like this:

output.pdf

Evaluation Boards structure

At worst/most-complicated case, the structure is:

• Overview
• User Guide
• Developer Overview
• Developer Guide
• Help and Support

With "User Guide" and "Developer Guide" containing multiples "plug&play" and technical guides, respectively.
Simpler evals, such as the pdf attached, may simplify the structure as needed.

Following the spirit of custom user guides,
here is a Contributing User Guide

from the following YAML:

project: "Documentation User Guide"
description: "How to contribute to the documentation repository"

include:
  - documentation/contributing


entry-point:
  - caption:
    files:
      - documentation/contributing

config:
  documentation:
    branch: "ad4052-template-eval"

then adoc custom-doc --builder pdf

[gastmaier]

Merging this to provide as an example, even though the content is shallow.