Add documentation build

Makefile

@@ -15,7 +15,7 @@ LIB = \
 	$(LIBGLFW)
 
 DOC = \
-	DESIGN.pdf
+	design.html
 
 CFLAGS = \
 	-I./ext/cglm/include  \
@@ -23,6 +23,7 @@ CFLAGS = \
 	-Wall -Wno-unused-function -std=c89 
 
 all: $(BIN) $(LIB)
+doc: $(DOC)
 
 $(BIN): $(OBJ) $(LIB)
 	$(CC) -lGL -lglfw -L.  -o $(BIN) $(OBJ)
@@ -39,13 +40,10 @@ clean:
 clean-all:
 	rm $(OBJ) $(DOC) $(LIB) $(BIN)
 
-.SUFFIXES: .ms .pdf .html .c .o
+.SUFFIXES: .nr .html .html .c .o
 
-.ms.pdf:
-	cat $< | sed -e "s/^\s*//g" -e "/^$$/d" | tbl| groff -Tpdf -fC -ms > $@
-
-.ms.html:
-	cat $< | sed -e "s/^\s*//g" -e "/^$$/d"| tbl | groff -Thtml -fC -ms > $@
+.nr.html:
+	cat $< | nulldoc > $@
 
 .c.o:
 	$(CC) $(CFLAGS) $< -c -o $@