Add make serve-docs target for local viewing

Signed-off-by: Nolan Brubaker <brubakern@vmware.com>

Makefile

@@ -214,3 +214,11 @@ changelog:
 
 release:
 	hack/goreleaser.sh
+
+serve-docs:
+	docker run \
+	--rm \
+	-v "$$(pwd)/site:/srv/jekyll" \
+	-it -p 4000:4000 \
+	jekyll/jekyll \
+	jekyll serve --livereload

site/README-JEKYLL.md

@@ -1,3 +1,7 @@
+# Running in Docker
+
+To run this site in a Docker container, you can use `make serve-docs` from the root directory.
+
 # Dependencies for MacOS
 
 Install the following for an easy to use dev environment: