logo + oidc client PostIt

src/Yavsc.Org/Views/Shared/_Nav.cshtml

@@ -1,5 +1,8 @@
 <nav class="navbar navbar-expand-sm navbar-dark bg-dark" aria-label="Yavsc">
-  <a class="navbar-brand" href="#">@Config.SiteSetup.Title</a>
+  <a class="navbar-brand" href="/">
+    <img src="~/images/yavsc-logo.svg" alt="Yavsc" style="height:32px; margin-right:8px; display:inline-block; vertical-align:middle;" />
+    @Config.SiteSetup.Title
+  </a>
     <button class="navbar-toggler" type="button" data-bs-toggle="collapse" 
       data-bs-target="#navbar" aria-controls="navbar" 
       aria-expanded="true" aria-label="Toggle navigation">
@@ -15,4 +18,3 @@
         </ul>
       </div>
   </nav>
-