add targets for dockerized local testing

Makefile

@@ -4,6 +4,13 @@ site:
 serve: site
 	cd _site && python -m SimpleHTTPServer 2> /dev/null || python3 -m http.server
 
+dock: site
+	docker run --name bloglocal -p 8000:8000 -v `pwd`/_site:/usr/share/nginx/html:ro -v `pwd`/local-nginx.conf:/etc/nginx/nginx.conf:ro nginx 
+
+undock:
+	docker stop bloglocal
+	docker rm bloglocal
+
 venv2:
 	virtualenv ~/.venv/makesite
 	echo . ~/.venv/makesite/bin/activate > venv