docs: point to fd.o for downloads instead of SourceForge

docs/download.html

@@ -9,14 +9,14 @@
 <H1>Downloading</H1>
 
 <p>
-Primary download site:
-<a href="http://sourceforge.net/project/showfiles.php?group_id=3"
-target="_parent">SourceForge</a>
+Primary Mesa download site:
+<a href="ftp://ftp.freedesktop.org/pub/mesa/"
+target="_parent">freedesktop.org</a> (FTP)
 </p>
 
 <p>
-When a new release is coming, release candidates (betas) can be found
-<a href="http://www.mesa3d.org/beta/">here</a>.
+When a new release is coming, release candidates (betas) may be found
+<a href="ftp://ftp.freedesktop.org/pub/mesa/beta/" target="_parent">here</a>.
 </p>