* Add Dask Chart
This supercedes the previous dask-distributed chart, which will be
deprecated.
This also uses an accurate docker image for the Jupyter server,
and pins docker images generally.
* Comment out resource limits
* Set chart version to 1.0.0, appVersion to 0.17.0
* Update README and chart information
* specify nthreads and memory-limit explicitly in values.yaml
* update notes
* avoid setting --nthreads and --memory-limit if no resource limits
* expand truncation to 63 characters, and trim "."
* bump app version number
* remove change to dask-distributed chart
* remove NOTES.txt
* use explicit repository and image tags
* respond to feedback
* remove specification of containerPorts
* update README
* resolve linting issues in values.yaml
* Clarify extra packages in README
* replace pip/conda/apt packages with generic env solution
* Add option to turn off Jupyter
Also, combine all jupyter documents into one file
* add missing {{ end }}
* split dask-jupyter to multiple files
* Fix Yaml issues
* Fix values.yaml
* Update README with instructions for installing custom packages
* Remove configurable components