set grid for logos to be one column

Author: jeromefv

doc/project/logo_usage_guidelines.rst

@@ -16,7 +16,7 @@ View the :doc:`/gallery/misc/logos2` to see the code to generate the logo using
 - Keep the ratio consistent
 - Maintain the same colors
 
-.. grid:: 2
+.. grid:: 1
 
     .. grid-item-card::  Primary logo light
 
@@ -26,8 +26,6 @@ View the :doc:`/gallery/misc/logos2` to see the code to generate the logo using
 
         .. image:: /_static/logo2_dark.svg
 
-.. grid:: 2
-
     .. grid-item-card::  Logo mark, same for both
 
         .. image:: /_static/large_logo_light.svg