Allow restoring the sunsetting announcement tab

Author: sergiou87

packages/welcome/package.json

@@ -35,7 +35,8 @@
   "deserializers": {
     "WelcomeView": "createWelcomeView",
     "GuideView": "createGuideView",
-    "ConsentView": "createConsentView"
+    "ConsentView": "createConsentView",
+    "SunsettingView": "createSunsettingView"
   },
   "dependencies": {
     "etch": "0.9.0"