Adding 2FA Authenticator Support (#66)

* Adding support for 2fa, more auth options

* WIP getting auth stuff working

* Added Manage views. 2FA working now for MVC app.

* Switching to using a controller for no-UI logout scenario

* Adding Razor Pages impl of 2FA auth stuff. Works.

src/Web/Views/Shared/_LoginPartial.cshtml

@@ -21,6 +21,14 @@
                             <img class="esh-identity-image" src="~/images/my_orders.png">
                         </a>
 
+                        <a class="esh-identity-item"
+                           asp-controller="Manage"
+                           asp-action="Index">
+
+                            <div class="esh-identity-name esh-identity-name--upper">My account</div>
+                            <img class="esh-identity-image" src="~/images/my_orders.png">
+                        </a>
+
                         <a class="esh-identity-item"
                            href="javascript:document.getElementById('logoutForm').submit()">