Merge branch 'ns/makefile-learn-to-remove-html-files' into next

Conflicts:
	Changelog.draft.rst

Makefile

@@ -35,9 +35,9 @@ clean:
 	-find . -name '*.pygc' -exec rm -f {} \;
 	-find . -name '*.class' -exec rm -f {} \;
 	-find . -name '.cache*' -exec rm -f {} \;
+	-find . -name '*.html' -exec rm -f {} \;
 	-rm -f manpage.links manpage.refs
 	-find . -name auth -exec rm -vf {}/password {}/username \;
-	-rm -f readme.html
 	@$(MAKE) -C docs clean
 
 man: