Added screenshots for emissary

Signed-off-by: Srujan Dharma <dharmassr@gmail.com>

Author: srujan0404

src/collections/integrations/_images/emissary/Emissary-Design-dark.png

@@ -15,8 +15,10 @@ featureList: [
   "Ongoing synchronization of Kubernetes configuration and changes across any number of clusters."
 ]
 workingSlides: [
-  ../_images/meshmap-visualizer.png,
-  ../_images/meshmap-designer.png
+  ../_images/emissary/Emissary-Design-light.png,
+  ../_images/emissary/Emissary-Design-dark.png,
+  ../_images/emissary/Emissary-Visualize-light.png,
+  ../_images/emissary/Emissary-Visualize-dark.png
 ]
 howItWorks: "Collaborative Infrastructure as Code"
 howItWorksDetails: "Collaboratively manage infrastructure with your coworkers synchronously sharing the same designs."