Fix documentation build logo related warning.
@@ -130,7 +130,7 @@ html_theme = 'sphinx_rtd_theme'
# The name of an image file (relative to this directory) to place at the top
# of the sidebar.
-html_logo = 'Colour_Logo_Small_001.png'
+html_logo = '_static/Colour_Logo_Small_001.png'
# The name of an image file (within the static path) to use as favicon of the
# docs. This file should be a Windows icon file (.ico) being 16x16 or 32x32
