fixed dockerfile to pin docutils to 0.17.1 for now (until docutils 0.20.1 works with jbook); removed unused logo.png

Author: trevorcampbell

Dockerfile

@@ -14,6 +14,7 @@ WORKDIR "${HOME}"
 RUN rm -rf work
 
 
+RUN pip install docutils==0.17.1 # Need to pin docutils to an old version for now, due to https://github.com/executablebooks/jupyter-book/issues/2022
 RUN pip install referencing
 RUN pip install jupyter-book
 RUN pip install numpy jinja2 altair_data_server altair_saver click ibis-framework ghp-import jupytext nodejs