implemented Discord OAuth2

Lieb/Shared/MainLayout.razor

@@ -10,6 +10,15 @@
     <main>
         <div class="top-row px-4">
             <a href="https://docs.microsoft.com/aspnet/" target="_blank">About</a>
+            <AuthorizeView>
+            <Authorized>
+                <a href="#">Hello, @context.User.Identity.Name!</a>
+                <a href="Account/Logout">Log out</a>
+            </Authorized>
+            <NotAuthorized>
+                <a href="Account/Login">Log in</a>
+            </NotAuthorized>
+        </AuthorizeView>
         </div>
 
         <article class="content px-4">

Lieb/Shared/SurveyPrompt.razor

@@ -1,16 +0,0 @@
-<div class="alert alert-secondary mt-4">
-    <span class="oi oi-pencil me-2" aria-hidden="true"></span>
-    <strong>@Title</strong>
-
-    <span class="text-nowrap">
-        Please take our
-        <a target="_blank" class="font-weight-bold link-dark" href="https://go.microsoft.com/fwlink/?linkid=2149017">brief survey</a>
-    </span>
-    and tell us what you think.
-</div>
-
-@code {
-    // Demonstrates how a parent component can supply parameters
-    [Parameter]
-    public string? Title { get; set; }
-}