refactor: rework Makefile and helper scripts

Makefile

@@ -5,7 +5,7 @@ out_files = $(fnl_files:fnl/%.fnl=lua/%.lua) $(help_file) $(help_file_mapping)
 
 all: $(out_files)
 
-fmt: $(fnl_files) gen_doc.fnl
+fmt: $(fnl_files) scripts/gen_doc.fnl
 	fnlfmt --fix $<
 
 lua/%.lua: fnl/%.fnl lua/
@@ -16,18 +16,18 @@ lua/:
 
 clean:
 	rm -rf lua
+	rm -rf doc
 
-doc: $(help_file)
+manual: $(help_file)
 
 $(help_file): $(help_file_mapping) doc/
-	rm $(help_file)
-	cat $(help_file_mapping) >>$(help_file)
+	cat $(help_file_mapping) >$(help_file)
 	rm $(help_file_mapping)
 
-$(help_file_mapping): gen_doc.fnl $(fnl_files)
-	fennel --raw-errors --no-compiler-sandbox --metadata --globals '*' gen_doc.fnl > $(help_file_mapping)
+$(help_file_mapping): scripts/gen_doc.fnl $(fnl_files)
+	fennel --raw-errors --no-compiler-sandbox --metadata --globals '*' scripts/gen_doc.fnl > $(help_file_mapping)
 
 doc/:
 	mkdir -p doc
 
-.PHONY: clean doc $(help_file_mapping)
+.PHONY: clean manual $(help_file_mapping)