Remove gallery2

It's not installed and we have never used it seriously. We have
a flickr account now anyway.

directory.xml

@@ -10,7 +10,6 @@
  <diritem title="Media" href="media/" />
  <diritem title="Wiki" absolute="true" href="http://wiki.csclub.uwaterloo.ca/" />
  <diritem title="Webmail" absolute="true" href="https://mail.csclub.uwaterloo.ca/" />
- <diritem title="Gallery" absolute="true" href="/gallery2/" />
  <diritem title="Stats" absolute="true" href="stats" />
  <diritem title="Library" href="library/" />
 </directory>

menu.xml

@@ -9,5 +9,4 @@
  <menuitem title="Webmail" icon="webmail" absolute="true" href="https://mail.csclub.uwaterloo.ca/"/>
  <menuitem title="Mailman" icon="mailman" absolute="true" href="/mailman/"/>
  <menuitem title="gitweb" icon="gitweb" absolute="true" href="http://gitweb.csclub.uwaterloo.ca/"/>
- <menuitem title="Gallery" icon="gallery" absolute="true" href="/gallery2/"/>
 </menudefs>