MailHog fine-tuning

docs/_includes/snippets/docker-compose-override-tree-view.rst

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+The Devilbox ships various example configurations to overwrite the default stack. Those files are
+located under ``compose/`` in the Devilbox git directory.
+
+``docker-compose.override.yml-all`` has all examples combined in one file for easy copy/paste.
+However, each example also exists in its standalone file as shown below:
+
+.. code-block:: bash
+
+   host> tree -L 1 compose/
+   compose/
+   ├── docker-compose.override.yml-all
+   ├── docker-compose.override.yml-mailhog
+   ├── docker-compose.override.yml-rabbitmq
+   └── README.md
+
+   0 directories, 4 files
+
+.. seealso:: :ref:`custom_container_enable_all_additional_container`