Removed outdated Android content, added redirections

Author: GrantMeStrength

.openpublishing.redirection.json

@@ -1,5 +1,25 @@
 {
   "redirections": [
+    {
+      "source_path": "hub/android/emulator.md",
+      "redirect_url": "/windows/dev-environment/",
+      "redirect_document_id": false
+    },
+    {
+      "source_path": "hub/android/native-android.md",
+      "redirect_url": "/windows/dev-environment/",
+      "redirect_document_id": false
+    },
+    {
+      "source_path": "hub/android/overview.md",
+      "redirect_url": "/windows/dev-environment/",
+      "redirect_document_id": false
+    },
+    {
+      "source_path": "hub/android/pwa.md",
+      "redirect_url": "/windows/dev-environment/",
+      "redirect_document_id": false
+    },
     {
       "source_path": "hub/apps/how-tos/uno-multiplatform.md",
       "redirect_url": "/previous-versions/windows/app-dev/how-tos/uno-multiplatform",