Update tar.xz paths to point directly at Chad's home dir on fdo

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Update release note paths where they use the old git repo urls

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Update url for XDC talk webm file

Point to file hosted in Chad's home directory on freedesktop.org.

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>