Merge pull request #230 from 10gen/DOP-4987

DOP-4987: Making landing page illustrations dark mode compatible

Author: mayaraman19

source/images/chapter-image-atlas.svg

@@ -33,7 +33,7 @@ Start with Guides
       :description: Get up and running with MongoDB Atlas.
          Learn how to create a cluster, load a sample dataset, and
          get your connection information.
-      :image: /images/chapter-image-atlas.png
+      :image: /images/chapter-image-atlas.svg
       :icon: atlas_database
 
       .. guide:: /atlas/account.txt
@@ -46,7 +46,7 @@ Start with Guides
    .. chapter:: CRUD
       :description: Learn how to perform these core operations with
          your preferred language and associated MongoDB Driver.
-      :image: /images/chapter-image-crud.png
+      :image: /images/chapter-image-crud.svg
       :icon: general_action_read
 
       .. guide:: /crud/install.txt