Consider adding a `More Info` button to the modal dialog prompt requiring users to install ipykernel

[DonJayamanne]

Probably consider adding a more info button here.

[IanMatthewHuff]

Validation.

Create a clean venv and select it as your notebook kernel.
Run a cell to get the missing ipykernel message
See if More Info shows and that it links to the wiki.

[joyceerhl]

I do see the More Info button, but if I click it, the modal dialog reappears, not sure if that's expected?