Getting started on how-to-play instructions.

Shogi.UI/Pages/Play/GameBoard/GameBoardPresentation.razor

@@ -66,7 +66,7 @@
 	</section>
 
 	<!-- Side board -->
-	@if (Session != null)
+	@if (Session != null && UseSideboard == true)
 	{
 		<aside class="side-board PrimaryTheme ThemeVariant--Contrast">
 			<div class="player-area">
@@ -121,6 +121,13 @@
 </article>
 
 @code {
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 	static readonly string[] Files = new[] { "A", "B", "C", "D", "E", "F", "G", "H", "I" };
 
 	/// <summary>
@@ -136,6 +143,7 @@
 	[Parameter] public Func<Piece, Task>? OnClickHand { get; set; }
 	[Parameter] public Func<Task>? OnClickJoinGame { get; set; }
 	[Parameter] public bool IsMyTurn { get; set; }
+	[Parameter] public bool UseSideboard { get; set; } = true;
 
 	private IReadOnlyCollection<Piece> opponentHand;
 	private IReadOnlyCollection<Piece> userHand;