Update the basics of the Upgrade Assistant (#42885)

* Handle articles

* Handle images

* housekeeping

* Lots of little things; alt-text

* Last little bits of warnings

* Fixed bad link

* Final edits

Author: adegeo

.openpublishing.redirection.core.json

@@ -877,6 +877,14 @@
             "source_path_from_root": "/docs/core/porting/upgrade-assistant-aspnetmvc.md",
             "redirect_url": "/aspnet/core/migration/mvc"
         },
+        {
+            "source_path_from_root": "/docs/core/porting/upgrade-assistant-install-legacy.md",
+            "redirect_url": "/dotnet/core/porting/upgrade-assistant-wcf"
+        },
+        {
+            "source_path_from_root": "/docs/core/porting/upgrade-assistant-uwp-framework.md",
+            "redirect_url": "/windows/apps/windows-app-sdk/migrate-to-windows-app-sdk/upgrade-assistant"
+        },
         {
             "source_path_from_root": "/docs/core/porting/upgrade-assistant-winforms-framework.md",
             "redirect_url": "/dotnet/desktop/winforms/migration/"
@@ -1345,10 +1353,6 @@
         {
             "source_path_from_root": "/docs/fundamentals/networking/tcp/tcp-overview.md",
             "redirect_url": "/dotnet/fundamentals/networking/sockets/tcp-classes"
-        },
-        {
-            "source_path_from_root": "/docs/core/porting/upgrade-assistant-uwp-framework.md",
-            "redirect_url": "/windows/apps/windows-app-sdk/migrate-to-windows-app-sdk/upgrade-assistant"
         }
     ]
 }