Use docker compose down for teardown

Suggested-by: Keith Chason <kchason@users.noreply.github.com>
Signed-off-by: Alex Nelson <alexander.nelson@nist.gov>

.github/workflows/docker_compose_ci.yml

@@ -41,4 +41,4 @@ jobs:
     - name: Confirm Docker Compose runs
       run: |
         docker compose up --wait
-        docker stop jekyll
+        docker compose down