Use nginx container-specific init folder

Dockerfile

@@ -4,12 +4,4 @@ FROM nginx:mainline-alpine
 RUN apk add hugo git
 
 # Copy over auxiliary scripts
-COPY aux /aux
-
-# Cron hook for pulling and building
-RUN echo "10 * * * * /aux/pull-n-build.sh" >> /var/spool/cron/crontabs/root
-
-# bootstrap script, basically cron && build
-# after that, the base-image-specific CMD will kick in, which is quite complex
-ENTRYPOINT /aux/bootstrap.sh
-
+COPY aux/* /docker-entrypoint.d/