Add cheatsheet just below listening game

index.html

@@ -30,7 +30,7 @@
                         Little games to play with Morse Code in your browser
                     </h1>
                     <h4>
-                        An unauthorized fork of <a href="https://alexanderell.is/posts/morse-code/">alexanderll.is</a>'s toy. My code <a href="https://nathanmcrae.name/gogs/nathanmcrae/morse-game">here</a>.
+                        An unauthorized fork of <a href="https://alexanderell.is/posts/morse-code/">alexanderll.is</a>'s toy. My code <a href="https://git.nathanmcrae.name/nathanmcrae/morse-game.git">here</a>.
                     </h4>
                 </header>
                 
@@ -60,6 +60,13 @@ available towards the bottom.</p>
 </div>
 <br>
 <br>
+<details>
+  <summary>Cheatsheet</summary>
+  <a href="https://upload.wikimedia.org/wikipedia/commons/1/19/Morse-code-tree.svg" target="blank_">
+  <img src="morse-code_files/International_Morse_Code.svg" alt="Alphabetical list of letters and their corresponding Morse Code representation">
+  </a>
+  <a href="https://en.wikipedia.org/wiki/File:International_Morse_Code.svg">Source</a>
+</details>
 <details>
   <summary>How to play the listening game</summary>
   <br>