dark icons (#664)

Author: mmeigs

source/images/icons/atlas.svg

@@ -133,23 +133,23 @@ Expand your knowledge of MongoDB by using Compass with other MongoDB products.
    .. card::
       :cta: Read Atlas docs
       :url: https://www.mongodb.com/docs/atlas/getting-started/
-      :icon: /images/icons/atlas.svg
+      :icon: atlas_product_family
       :icon-alt: MongoDB Atlas icon
 
       Use Compass to connect to your Atlas cluster
 
    .. card::
       :cta: Learn MongoDB Basics
       :url: https://university.mongodb.com/courses/M001/about
-      :icon: /images/icons/university.svg
+      :icon: general_content_learn
       :icon-alt: MongoDB University icon
 
       Learn MongoDB Basics with MongoDB University
 
    .. card::
       :cta: Read Server docs
       :url: https://www.mongodb.com/docs/manual/tutorial/getting-started/
-      :icon: /images/icons/server.svg
+      :icon: mdb_database
       :icon-alt: MongoDB Server icon
 
       Access more in-depth examples of querying data