:sparkle: Improve aggregated metadata filename

Add the particle gen to spot it as a generated file.

makefile

@@ -35,11 +35,11 @@ build: $(GEN_FILES)
 	$(PANDOC_GEN) --metadata-file $*.meta.yml --output $@ $<
 
 # Build lists
-src/projets/list.meta.yml: $(LISTED_META_FILES)
+src/projets/list.gen.yml: $(LISTED_META_FILES)
 	$(LIST_GEN) $(LISTED_META_FILES) > $@
 
-src/projets/content.gen.html: src/projets/content.src.html src/projets/content.meta.yml src/projets/list.meta.yml
-	$(PANDOC_GEN) --metadata-file src/projets/content.meta.yml --metadata-file src/projets/list.meta.yml --output $@ $<
+src/projets/content.gen.html: src/projets/content.src.html src/projets/content.meta.yml src/projets/list.gen.yml
+	$(PANDOC_GEN) --metadata-file src/projets/content.meta.yml --metadata-file src/projets/list.gen.yml --output $@ $<
 
 # Distribution
 .PHONY: dist