Replace custom socket implementation with SignalR.

Replace MSAL and custom cookie auth with Microsoft.Identity.EntityFramework
Also some UI redesign to accommodate different login experience.

Shogi.UI/Layout/NavMenu.razor.css

@@ -0,0 +1,15 @@
+.NavMenu {
+	display: flex;
+	flex-direction: column;
+	border-right: 2px solid #444;
+}
+
+.NavMenu > * {
+	padding: 0 0.5rem;
+}
+.NavMenu h1 {
+}
+
+.NavMenu .spacer {
+	flex: 1;
+}