Automatically rewrite links to localhost when developing on docs locally.

scripts/dev-docs

@@ -2,9 +2,8 @@
 
 set -e
 
-docker build --tag borgmatic-docs --file docs/Dockerfile .
+docker build --tag borgmatic-docs --build-arg ENVIRONMENT=dev --file docs/Dockerfile .
 echo
 echo "You can view dev docs at http://localhost:8080"
-echo "Note that links within these docs will go to the online docs, so you will need to fiddle with URLs manually to stay in the dev docs."
 echo
 docker run --interactive --tty --publish 8080:80 --rm borgmatic-docs