(DOCSP-45724) Updates landing zone diagram with Barry's changes (#68)

Author: sarahsimpers

source/includes/images/LandingZone.png

@@ -209,21 +209,14 @@ Example Landing Zone Diagram
 
 The following example diagram unifies many of the architectural diagrams
 across the {+atlas-arch-center+} in one image to visualize your
-landing zone. You can download
-the `SVG of the example diagram in Github 
-<https://github.com/mongodb/docs-atlas-architecture/blob/main/source/includes/images/LandingZone.svg>`__, upload it to an SVG editor,
-and adjust it as needed to customize it for your organization.
+landing zone. You can adjust it as needed to customize it for your organization.
 
 **DIAGRAM BELOW TO BE CHANGED FOR FINAL DIAGRAM**
 
-.. If you update the following diagram PNG file, you must also update
-.. the SVG file with the same name in /includes/images/.
-.. Customers can download the SVG from Github and edit it.
-
-.. image:: /includes/images/LandingZone.png
+.. figure:: /includes/images/LandingZone.svg
    :alt: "A diagram showing an example {+service+} landing zone."
-   :width: 750px
    :align: center
+   :lightbox:
 
 Information in the {+atlas-arch-center+}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~