Fix some favicon issues

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

sphinx_ansible_theme/layout.html

@@ -4,15 +4,16 @@
 #}
 {%-
     set ansible_logo_url = logo_url
-        or ('_static/' + (logo or 'images/Ansible-Mark-RGB_White.svg'))
+        or ('_static/' + (logo or 'images/Ansible-Mark-RGB_White.png'))
 %}
 {%- set logo_url = '' %}{# Reset to prevent render in the RTD theme #}
 {%- set logo = logo_url %}
 {%-
     set favicon_url = favicon_url
-        or ('_static/' + (favicon or 'images/Ansible-Mark-RGB_Black.svg'))
+        or ('_static/' + (favicon or 'images/Ansible-Mark-RGB_Black.png'))
 %}
 {%- set favicon = favicon_url | replace('_static/', '', 1) %}
+{%- set favicon_url = pathto(favicon_url, 1) if '//' not in favicon_url and not favicon_url.startswith('/') else favicon_url %}
 
 {%- extends "sphinx_rtd_theme/layout.html" %}