refactor(api): rename api composer/django/ dir to docker/

Part-of: <https://dev.funkwhale.audio/funkwhale/funkwhale/-/merge_requests/2302>

api/docker/server.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+set -eux
+
+funkwhale-manage collectstatic --noinput
+funkwhale-manage migrate
+
+# shellcheck disable=SC2086
+gunicorn config.asgi:application \
+    --workers "${FUNKWHALE_WEB_WORKERS-1}" \
+    --worker-class uvicorn.workers.UvicornWorker \
+    --bind 0.0.0.0:5000 \
+    ${GUNICORN_ARGS-}