Bash kernel on binder

[mwouts]

Hello @takluyver ,

Thank you for the Bash Kernel, I find it so useful to share or demo bash scripts!

Would you like to provide a link to a binder with the bash_kernel? This is what this PR does.

The link in the README will work only once this PR is merged. Meanwhile you can test it at https://mybinder.org/v2/gh/mwouts/bash_kernel/bash_kernel_on_binder

If you like we could also think of

• documenting how to do this in the README
• adding jupytext to binder/requirements.txt to allow Jupyter to open .sh files as Bash notebooks

Let me know what you think,

Marc