Add link to MUP signature form

services/machine_usage.xml

@@ -18,6 +18,10 @@ available (this section will contain links to them when they do become
 available).  There is also a brief (instead of legalese)
 <a href="machine_usage_summary.html">summary of the usage policy</a> available.
 </p>
+<p>
+The usage policy signature form is available as an <a
+href="/misc/usage_agreement.odt">ODT file</a>.
+</p>
 </section>
 
 <section title="Usage Policy">

services/machine_usage_summary.xml

@@ -13,7 +13,10 @@ available).  This is a brief (instead of legalese) version of the
 Everyone who receives an account on one of the CSC machines must sign
 the agreement based on the usage policy, and this summary lists the
 things that the users will agree to.
-
+</p>
+<p>
+The usage policy signature form is available as an <a
+href="/misc/usage_agreement.odt">ODT file</a>.
 </p>
 </section>