nlroff -> markdown

Makefile

@@ -14,16 +14,12 @@ OBJ = \
 LIB = \
 	$(LIBGLFW)
 
-DOC = \
-	doc/design.html
-
 CFLAGS = \
 	-I./ext/cglm/include  \
 	-I./ext/glfw/include  \
 	-Wall -Wno-unused-function -std=c89 
 
 all: $(BIN) $(LIB)
-doc: $(DOC)
 
 $(BIN): $(OBJ) $(LIB)
 	$(CC) -lGL -lglfw -L.  -o $(BIN) $(OBJ)
@@ -40,10 +36,7 @@ clean:
 clean-all:
 	rm $(OBJ) $(DOC) $(LIB) $(BIN)
 
-.SUFFIXES: .nr .html .html .c .o
-
-.nr.html:
-	cat $< | nlroff > $@
+.SUFFIXES: .c .o
 
 .c.o:
 	$(CC) $(CFLAGS) $< -c -o $@