[FIX] odoo_theme: fix logo colors

Before this commit, the Odoo logos used in the documentation were
using the old purple color.

This commit updates all these old logos with the latest version that
can be found on the Odoo brand-asset page

https://www.odoo.com/page/brand-assets

task-3328677

closes odoo/documentation#5540

Signed-off-by: Antoine Vandevenne (anv) <anv@odoo.com>

extensions/odoo_theme/static/img/logos/odoo_logo.svg

@@ -3,8 +3,8 @@
 <svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
 	 viewBox="0 0 126.2 40" style="enable-background:new 0 0 126.2 40;" xml:space="preserve">
 <style type="text/css">
-	.st0{fill:#939598;}
-	.st1{fill:#875A7B;}
+	.st0{fill:#8F8F8F;}
+	.st1{fill:#714B67;}
 </style>
 <g id="Group_982" transform="translate(-13.729 -4.35)">
 	<path id="Path_172" class="st0" d="M60.9,38c4.9,0,8.9-4,8.9-8.9c0-4.9-4-8.9-8.9-8.9c-4.9,0-8.9,4-8.9,8.9c0,0,0,0,0,0