OF: unnecessary (and wrong)

The pelican command creates the output directory as necessary.
In any case, the default in buildsite.py is site-generated not /site-generated.
diff --git a/Dockerfile b/Dockerfile
index 2d54b22..3c180c1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -87,5 +87,5 @@
 
 # Run Pelican
 WORKDIR /site
-RUN mkdir -p /site-generated
+
 ENTRYPOINT [ "/bin/bash", "-c", "source /tmp/pelican-asf/LIBCMARKDIR.sh && /tmp/pelican-asf/bin/buildsite.py dir --listen" ]