put lántas svgs in a directory named after the page

Makefile

@@ -37,8 +37,10 @@ build: $(OUTPUT)
 $(BUILDDIR)/%.html: $(PAGESDIR)/%.md $(TEMPLATE) $(LANGFILTER) $(LAANTAS_SCRIPT)
 	@echo "[pandoc] $<"
 	mkdir -p $(dir $@)
+	mkdir -p $(basename $@)
 	LAANTAS_SCRIPT="$(LAANTAS_SCRIPT)" \
-	  DIRNAME="$(subst $(PAGESDIR),$(BUILDDIR),$(dir $<))" \
+	  DIRNAME="$(basename $@)" \
+	  FILENAME="$@" \
 	  pandoc -s --toc --template $(TEMPLATE) -o $@ $< \
 	    --filter $(LANGFILTER)