added uninstall.sh

provides a convenient way to remove the jupyter kernel configuration
and the singularity image.

uninstall.sh

+#~/bin/bash
+source environment.sh
+container_name=${IMAGE_NAME%.sif}_$version
+version=${1:-latest}
+echo "removing kernel..."
+rm -r ~/.local/share/jupyter/kernels/"$container_name"
+echo "removing singularity image"
+rm ~/singularity-images/"$container_name".sif
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