remove some dead files

mods/aftermath/merge-rules.yaml

@@ -1,2 +0,0 @@
-DTRK:
-	-Chronoshiftable:

mods/cnc/missions.pkt

@@ -1,17 +0,0 @@
-[Missions]
-SCM01EA.INI=Green Acres
-SCM02EA.INI=Sand Trap
-SCM03EA.INI=Lost Arena
-SCM04EA.INI=River Raid
-SCM05EA.INI=Eye of the Storm
-SCM06EA.INI=Lakefront Clash
-SCM07EA.INI=Desert Madness
-SCM08EA.INI=Pitfall
-SCM09EA.INI=Moosehead Barrons
-SCM70EA.INI=Winter Waterland
-SCM71EA.INI=One Pass Fits All
-SCM72EA.INI=Straight and Narrow
-SCM73EA.INI=King takes Pawn
-SCM74EA.INI=Nowhere to Hide
-SCM77EA.INI=Marooned
-SCM96EA.INI=Tiberium Garden