Drop reference to no longer existent Scanner Search Engine

It went away when the Debian folks pulled the plug on Alioth :-(

sane-supported-devices.html

@@ -26,18 +26,6 @@
     
     <hr>
 
-
-    <h2><a href="https://sane.alioth.debian.org/cgi-bin/driver.pl">Scanner Search Engine</a></h2>
-    <p>
-      The <a href="https://sane.alioth.debian.org/cgi-bin/driver.pl">search engine</a> knows if your scanner is supported and
-      if yes, by which backend.  If it's not supported, it may at least point
-      to documentation or test programs.  The search engine contains
-      information from the latest stable SANE release, the development ("git") version
-      of SANE and from external backends. The database is updated once per day.
-    </p>
-
-    <br>
-
     <h2>Lists of Devices</h2>
     <p>
       The lists of devices contain information not only about