Ported progress from SPA and began scaffolding Identity UI.

Laid some groundwork in backend.

Began customizing Identity UI.

Props/Areas/Identity/Pages/Account/Manage/ManageNavPages.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc.Rendering;
+
+namespace Props.Areas.Identity.Pages.Account.Manage
+{
+    public static class ManageNavPages
+    {
+        public static string Index => "Index";
+
+        public static string Email => "Email";
+
+        public static string ChangePassword => "ChangePassword";
+
+        public static string DownloadPersonalData => "DownloadPersonalData";
+
+        public static string DeletePersonalData => "DeletePersonalData";
+
+        public static string ExternalLogins => "ExternalLogins";
+
+        public static string PersonalData => "PersonalData";
+
+        public static string TwoFactorAuthentication => "TwoFactorAuthentication";
+
+        public static string IndexNavClass(ViewContext viewContext) => PageNavClass(viewContext, Index);
+
+        public static string EmailNavClass(ViewContext viewContext) => PageNavClass(viewContext, Email);
+
+        public static string ChangePasswordNavClass(ViewContext viewContext) => PageNavClass(viewContext, ChangePassword);
+
+        public static string DownloadPersonalDataNavClass(ViewContext viewContext) => PageNavClass(viewContext, DownloadPersonalData);
+
+        public static string DeletePersonalDataNavClass(ViewContext viewContext) => PageNavClass(viewContext, DeletePersonalData);
+
+        public static string ExternalLoginsNavClass(ViewContext viewContext) => PageNavClass(viewContext, ExternalLogins);
+
+        public static string PersonalDataNavClass(ViewContext viewContext) => PageNavClass(viewContext, PersonalData);
+
+        public static string TwoFactorAuthenticationNavClass(ViewContext viewContext) => PageNavClass(viewContext, TwoFactorAuthentication);
+
+        private static string PageNavClass(ViewContext viewContext, string page)
+        {
+            var activePage = viewContext.ViewData["ActivePage"] as string
+                ?? System.IO.Path.GetFileNameWithoutExtension(viewContext.ActionDescriptor.DisplayName);
+            return string.Equals(activePage, page, StringComparison.OrdinalIgnoreCase) ? "active" : null;
+        }
+    }
+}

Props/Areas/Identity/Pages/Account/Manage/_Layout.cshtml

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+@{
+    if (ViewData.TryGetValue("ParentLayout", out var parentLayout))
+    {
+        Layout = (string)parentLayout;
+    }
+    else
+    {
+        Layout = "/Areas/Identity/Pages/_Layout.cshtml";
+    }
+}
+
+<div class="container">
+    <h1>Manage your account</h1>
+
+    <div>
+        <h4>Change your account settings</h4>
+        <hr />
+        <div class="row">
+            <div class="col-md-3">
+                <partial name="_ManageNav" />
+            </div>
+            <div class="col-md-9">
+                @RenderBody()
+            </div>
+        </div>
+    </div>
+</div>
+
+
+@section Scripts {
+@RenderSection("Scripts", required: false)
+}

Props/Areas/Identity/Pages/Account/Manage/_ManageNav.cshtml

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+@inject SignInManager<ApplicationUser> SignInManager
+@{
+    var hasExternalLogins = (await SignInManager.GetExternalAuthenticationSchemesAsync()).Any();
+}
+<ul class="nav nav-pills flex-column">
+    <li class="nav-item"><a class="nav-link @ManageNavPages.IndexNavClass(ViewContext)" id="profile" asp-page="./Index">Profile</a></li>
+    <li class="nav-item"><a class="nav-link @ManageNavPages.EmailNavClass(ViewContext)" id="email" asp-page="./Email">Email</a></li>
+    <li class="nav-item"><a class="nav-link @ManageNavPages.ChangePasswordNavClass(ViewContext)" id="change-password" asp-page="./ChangePassword">Password</a></li>
+    @if (hasExternalLogins)
+    {
+        <li id="external-logins" class="nav-item"><a id="external-login" class="nav-link @ManageNavPages.ExternalLoginsNavClass(ViewContext)" asp-page="./ExternalLogins">External logins</a></li>
+    }
+    <li class="nav-item"><a class="nav-link @ManageNavPages.TwoFactorAuthenticationNavClass(ViewContext)" id="two-factor" asp-page="./TwoFactorAuthentication">Two-factor authentication</a></li>
+    <li class="nav-item"><a class="nav-link @ManageNavPages.PersonalDataNavClass(ViewContext)" id="personal-data" asp-page="./PersonalData">Personal data</a></li>
+</ul>

Props/Areas/Identity/Pages/Account/Manage/_StatusMessage.cshtml

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+@model string
+
+@if (!String.IsNullOrEmpty(Model))
+{
+    var statusMessageClass = Model.StartsWith("Error") ? "danger" : "success";
+    <div class="alert alert-@statusMessageClass alert-dismissible" role="alert">
+        <button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">&times;</span></button>
+        @Model
+    </div>
+}

Props/Areas/Identity/Pages/Account/Manage/_ViewImports.cshtml

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+@using Props.Areas.Identity.Pages.Account.Manage