Fix more absolute links.

Shogi.UI/Layout/NavMenu.razor

@@ -4,12 +4,12 @@
 <div class="NavMenu PrimaryTheme ThemeVariant--Contrast">
 	<h1>Shogi</h1>
 	<p>
-		<a href="/">Home</a>
+		<a href="">Home</a>
 	</p>
 
 	<AuthorizeView>
 		<p>
-			<a href="/search">Search</a>
+			<a href="search">Search</a>
 		</p>
 
 		<p>
@@ -45,7 +45,7 @@
 		var sessionId = await Api.PostSession();
 		if (!string.IsNullOrEmpty(sessionId))
 		{
-			navigator.NavigateTo($"/play/{sessionId}");
+			navigator.NavigateTo($"play/{sessionId}");
 		}
 	}