Remove app snapshots tests and documentation

Author: Nicholas King

src/ResourceManager/Websites/Commands.Websites.Test/ScenarioTests/WebAppBackupRestoreTests.cs

@@ -68,19 +68,5 @@ public void TestEditAndGetWebAppBackupConfigurationPiping()
         {
             WebsitesController.NewInstance.RunPsTest("Test-EditAndGetWebAppBackupConfigurationPiping");
         }
-
-        [Fact(Skip = "Snapshots release postponed for API rework")]
-        [Trait(Category.AcceptanceType, Category.CheckIn)]
-        public void TestGetWebAppSnapshots()
-        {
-            WebsitesController.NewInstance.RunPsTest("Test-GetWebAppSnapshots");
-        }
-
-        [Fact(Skip = "Snapshots release postponed for API rework")]
-        [Trait(Category.AcceptanceType, Category.CheckIn)]
-        public void TestRestoreWebAppSnapshot()
-        {
-            WebsitesController.NewInstance.RunPsTest("Test-RestoreWebAppSnapshot");
-        }
     }
 }