make AA image link to homepage

templates/p.html

@@ -2,7 +2,9 @@
 {{template "header.html" $head}}
 
 <header>
-	<img src="/static/audioaxis-white.png" alt="Audio Axis" class="aa">
+	<a href="/">
+		<img src="/static/audioaxis-white.png" alt="Audio Axis" class="aa">
+	</a>
 	<form onsubmit="return search(this.song.value)">
 		<label for="user">Username:</label>
 		<input type="text" id="user" value="anonymous" size="16" onkeypress="return userKeyPress(event)">