syntax: mgp: drop the almost-empty MagicPoint file and syntax

It colored any word after a % sign.  But a good syntax would color
only the valid commands, and also the ones after a comma.

syntax/Makefile.am

@@ -21,7 +21,6 @@ pkgdata_DATA =	asm.nanorc \
 		lua.nanorc \
 		makefile.nanorc \
 		man.nanorc \
-		mgp.nanorc \
 		nanohelp.nanorc \
 		nanorc.nanorc \
 		nftables.nanorc \

syntax/mgp.nanorc

@@ -1,9 +0,0 @@
-## Here is an example for Magicpoint presentations.
-
-syntax mgp "\.mgp$"
-header "^%include.*"
-comment "#"
-
-color green "^%[A-Za-z].*"
-color cyan "(^|[[:space:]])(#|%%).*"
-color ,green "[[:space:]]+$"