Make the articles before the main pages

This way the export target doesn't have to be called twice to update the
list of posts.

Makefile

@@ -5,10 +5,10 @@ clean:
 	rm -rf _publish/projects
 
 export: clean
+	$(MAKE) -C articles export
 	emacs -L $(CURDIR) -L ~/.emacs.d/vendor-lisp/org/lisp \
 		-L ~/.emacs.d/vendor-lisp/org/contrib/lisp -batch -l project.el \
 		-f org-publish-all
-	$(MAKE) -C articles export
 
 publish: export
 	rsync -avuz --exclude=*~ --exclude=dotfiles/ --delete _publish/ \