[IMP] theme_graphene: update the theme

This commit updates the theme to improve the design with new colors, new
pictures and new snippet customizations.

task-2612003

X-original-commit: c801cdb133
Part-of: odoo/design-themes#501

theme_graphene/static/src/js/tour.js

@@ -17,16 +17,16 @@ const snippets = [
         name: 'Text - Image',
     },
     {
-        id: 's_three_columns',
-        name: 'Columns',
+        id: 's_numbers',
+        name: 'Numbers',
     },
     {
-        id: 's_company_team',
-        name: 'Team',
+        id: 's_picture',
+        name: 'Picture',
     },
     {
-        id: 's_call_to_action',
-        name: 'Call to Action',
+        id: 's_comparisons',
+        name: 'Comparisons',
     },
 ];