Makefile: clean-intermediate: Clean more in "disk/"

Also, more comments in Makefile about how to release
(for Future-Me).

Author: billkendrick

Makefile

@@ -9,8 +9,15 @@
 ## Version number:
 ## (Note: Any alphabetic chars should be uppercase!)
 VERSION=0.1-BETA1
+
+## Run "tools/release.sh" to generate a release ZIP file
+## (it will be named based on VERSION above,
+## and the date (not from below)).
+
+## Version date:
 DATE=${shell /usr/bin/date +"%Y-%m-%d"}
 
+
 ## Binaries:
 CC65BIN=/usr/bin
 CC65=${CC65BIN}/cc65
@@ -51,15 +58,15 @@ run-disk:	firefite.atr
 clean:	clean-intermediate
 	-rm firefite.xex
 	-rm firefite.atr
-	-rm disk/FIREFITE.AR0
-	-rm disk/README.txt
 
 clean-intermediate:
 	-rm obj/*.o
 	-rm asm/*.s
 	-rm firefite.map
 	-rm data/levels.dat
 	-rm firefths.xex
+	-rm disk/FIREFITE.AR0
+	-rm disk/README.txt
 
 
 ## Files to generate: