rename index creation script

Dockerfile.debian-bullseye-directory-listening

@@ -7,4 +7,4 @@ RUN apt-get -qq update && \
     apt-get -qq install python3 python3-jinja2 && \
     apt-get -qq clean
 
-COPY directory-listening/create-index.py /usr/local/bin/create-index
+COPY directory-listening/create-index.py /usr/local/bin/create-directory-html-index