Add lists of stuff bought for shopping, so we can work out consumption

levels over time.

years/2015/index.html

@@ -21,6 +21,7 @@
 <li><a href="stuffleftattopcamp.html">stuff left at top camp</a></li>
 <li><a href="biertent.html">Bier tent survey</a></li>
 <li><a href="logbook.html">Logbook</a> (incomplete)</li>
+<li><a href="stuffbought.html">Things bought 2015</a></li>
 </ul>
 </div>
 <hr />