Since the README is not intended to be installed to the system it makes
sense to provide the NOTES section in the manual itself which is.
This also expands the SYNOPSIS section to indicate that the usage of sx
should work as a typical chain command.
There's not a lot of point in absorbing the xserver's log file when it
will just be less intuitive for those looking for it in the standard
location. Since the log is generated by Xorg and not sx, it only seems
reasonable.
This commit also renames xauthfile to xauthority for a little more
consistency with documentation and prior art.