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/Pages/HomePage.razor

@@ -0,0 +1,26 @@
+@page "/"
+
+@using Shogi.Contracts.Types
+@using System.Net.WebSockets
+@using System.Text
+
+<main class="shogi PrimaryTheme">
+	<p>How to play goes here</p>
+	<p>Maybe a cool animation of a game being played.</p>
+</main>
+
+@code {
+
+	private string activeSessionName = string.Empty;
+
+	private Task OnLoginChanged()
+	{
+		StateHasChanged();
+		return Task.CompletedTask;
+	}
+	private void OnChangeSession(SessionMetadata s)
+	{
+		activeSessionName = s.SessionId.ToString();
+		StateHasChanged();
+	}
+}