Add instructions/source for logos.

README.rst

@@ -4,3 +4,16 @@ sphinx_ansible_theme
 A reusable Ansible Sphinx Theme.
 
 Demo-site at https://sphinx-ansible-theme.readthedocs.io/en/latest/
+
+Logos in ``sphinx_ansible_theme/static/images/``
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The Ansible logos are taken from `the official Ansible Community logo download page <https://www.ansible.com/logos>`_. The files are slightly modified as follows:
+
+* The SVG logos' bounding boxes are modified from ``0 0 300 300`` to ``30 30 240 240``.
+* The PNG files are rescaled to 180x180 using ImageMagick as follows:
+
+  .. code-block:: sh
+
+    convert Ansible-Mark-Large-RGB-Black.png -resize 180x180 Ansible-Mark-RGB_Black.png
+    convert Ansible-Mark-Large-RGB-White.png -resize 180x180 Ansible-Mark-RGB_White.png