Update Dockerfile

Dockerfile

@@ -98,7 +98,7 @@ RUN chown 1000:1000 /opt/conda && \
     ln -s /home/${NB_USER} /home/jovyan
 
 # customize RStudio
-COPY config/dictionaries/* /usr/share/hunspell/
+COPY .config/dictionaries/* /usr/share/hunspell/
 RUN mkdir -p /home/rstudio/.config/rstudio/dictionaries && \
     chown 1000:1000 /home/rstudio/.config/rstudio/dictionaries && \
     mkdir -p /home/rstudio/.config/rstudio/dictionaries/languages-system && \
@@ -115,8 +115,8 @@ RUN mkdir -p /home/rstudio/.config/rstudio/dictionaries && \
     chown 1000:1000 /home/rstudio/.config/rstudio/dictionaries/languages-system/* && \
     chown 1000:1000 /home/rstudio/.config/rstudio && \
     mkdir -p /etc/rstudio/snippets
-COPY config/snippets/r.snippets /etc/rstudio/snippets
-COPY config/rstudio-prefs.json /etc/rstudio
+COPY .config/snippets/r.snippets /etc/rstudio/snippets
+COPY .config/rstudio-prefs.json /etc/rstudio
 
 # Uncomment and adapt if code is to be included in the image
 # COPY src /code/src