[Fixes #245] Update Identity to use the default layout from the application.

Added /Areas/Identity/Pages/_ViewStart.cshtml and set the layout to the
applications layout.

src/Microsoft.DotNet.Web.ProjectTemplates/content/RazorPagesWeb-CSharp/.template.config/template.json

@@ -56,7 +56,8 @@
         {
           "condition": "(!IndividualLocalAuth)",
           "exclude": [
-            "Data/**"
+            "Data/**",
+            "Areas/**"
           ]
         },
         {

src/Microsoft.DotNet.Web.ProjectTemplates/content/RazorPagesWeb-CSharp/Areas/Identity/Pages/_ViewStart.cshtml

@@ -0,0 +1,3 @@
+@{
+    Layout = "/Pages/_Layout.cshtml";
+}

src/Microsoft.DotNet.Web.ProjectTemplates/content/StarterWeb-CSharp/.template.config/template.json

@@ -49,7 +49,8 @@
         {
           "condition": "(!IndividualAuth)",
           "exclude": [
-            "Data/**"
+            "Data/**",
+            "Areas/**"
           ]
         },
         {

src/Microsoft.DotNet.Web.ProjectTemplates/content/StarterWeb-CSharp/Areas/Identity/Pages/_ViewStart.cshtml

@@ -0,0 +1,3 @@
+@{
+    Layout = "/Views/Shared/_Layout.cshtml";
+}