versions and tidymodels

- added versions to ggplot2 and sparklyr for all-spark-notebook
- added tidymodels to r-notebook and docs

closes #1102

all-spark-notebook/Dockerfile

@@ -23,7 +23,7 @@ USER $NB_UID
 
 # R packages
 RUN conda install --quiet --yes \
-    'r-base=3.6.3' \
+    'r-base=4.0*' \
     'r-ggplot2=3.3*' \
     'r-irkernel=1.1*' \
     'r-rcurl=1.98*' \