Add a Setup Guide button to the landing page

WebHostLib/templates/landing.html

@@ -25,6 +25,9 @@
                 <a href="{{ url_for("uploads") }}">
                     <button>Host Existing Game</button>
                 </a>
+                <a href="/tutorial">
+                    <button>Setup Guide</button>
+                </a>
                 <a href="{{ url_for("mysterycheck") }}">
                     <button>Test YAML Config</button>
                 </a>