chore(makefile): enable documentation generation using

Makefile

@@ -49,3 +49,14 @@ ci:
 
 ci-daemon:
 	HOME=$(PWD)/.. $(EMACS) --daemon 2>&1
+
+make-readme-markdown.el:
+	wget -q -O $@ https://raw.github.com/mgalgs/make-readme-markdown/master/make-readme-markdown.el
+
+combined.el:
+	cat init.el early-init.el core/me-{vars,lib,builtin,fonts,gc,compat,core-ui}.el modules/me-*.el modules/extras/me-*.el >combined.el
+
+docs: combined.el make-readme-markdown.el
+	emacs --script make-readme-markdown.el <combined.el >DOCS.md 2>/dev/null
+
+.INTERMEDIATE: make-readme-markdown.el combined.el