Add lightboxes to large images to aid readability

windows/configuration/start-layout-troubleshoot.md

@@ -43,7 +43,7 @@ When troubleshooting basic Start issues (and for the most part, all other Window
   - `get-AppXPackage -Name Microsoft.Windows.ShellExperienceHost`
   - `get-AppXPackage -Name Microsoft.Windows.Cortana`
 
-    ![Example of output from cmdlets.](images/start-ts-1.png)
+     :::image type="content" alt-text="Example of output from cmdlets." source="images/start-ts-1.png" lightbox="images/start-ts-1.png":::
 
     Failure messages will appear if they aren't installed
 
@@ -189,7 +189,7 @@ Events for both PDC and Background Tasks Infrastructure Service will be recorded
 
 ### Symptom: Application tiles like Alarm, Calculator, and Edge are missing from Start menu and the Settings app fails to open on Windows 10, version 1709 when a local user profile is deleted
 
-![Screenshots that show download icons on app tiles and missing app tiles.](images/start-ts-2.png)
+:::image type="content" alt-text="Screenshots that show download icons on app tiles and missing app tiles." source="images/start-ts-2.png" lightbox="images/start-ts-2.png":::
 
 **Cause**: This issue is known. The first-time sign-in experience is not detected and does not trigger the install of some apps.
 

windows/configuration/ue-v/uev-prepare-for-deployment.md

@@ -44,7 +44,7 @@ If you want to use UE-V to synchronize user-defined settings for custom applicat
 
 The workflow diagram below illustrates a typical UE-V deployment and the decisions you need to be prepared to make.
 
-![UE-V deployment preparation.](images/uev-deployment-preparation.png)
+:::image type="content" alt-text="UE-V deployment preparation." source="images/uev-deployment-preparation.png":::
 
 <!-- PRESERVING ^ORIGINAL IMAGE CODING JUST IN CASE
 <img src="media/image1.png" width="446" height="362" />