restore deleted file (w redirect and toc updates) and remove Win8 references (#3640)

* restore deleted file (w redirect and toc updates) and remove Win8 references

* build warnings

* build warning

Author: Karl-Bridge-Microsoft

.openpublishing.redirection.json

@@ -1930,11 +1930,6 @@
       "redirect_url": "/windows/uwp/devices-sensors/",
       "redirect_document_id": false
     },
-    {
-      "source_path": "uwp/devices-sensors/host-card-emulation.md",
-      "redirect_url": "/windows/uwp/devices-sensors/",
-      "redirect_document_id": false
-    },
     {
       "source_path": "uwp/devices-sensors/generate-3mf.md",
       "redirect_url": "/windows/uwp/devices-sensors/3d-generate-3mf",