Remove the keyboard shortcut to move cells up/down from the documentation

[parthea]

Closes #777

The following keyboard shortcuts are no longer supported in Jupyter Notebook 4.2:

• Ctrl+K - move cell up
• Ctrl+J - move cell down

I've confirmed that the other keyboard shortcuts documented in Datalab are still functional.

[yebrahim]

Thanks for catching that. Did the shift+tab quick help work for you? It doesn't for me on Chrome/Mac

[parthea]

@yebrahim Thanks for reviewing this!

Yes, I was able to get the quick help to work on Ubuntu/Chrome. I haven't tried Mac.

Can you try the following steps?

• In otherwise empty cell, run the following:

import datalab.bigquery as bq

• Type bq.Query in a new cell. With the cursor at the end of bq.Query, try the shift+tab shortcut.
  

[nikhilk]

A notebook is in two modes - command mode (cell is selected) and edit mode (code cell is activated). Things like shortcuts to move cells only apply to command mode.

[parthea]

Note: The keyboard shortcut to move cells up/down has been removed from Jupyter (ipython/ipython#7732).

[yebrahim]

This is a shame, I wonder why they're taking it away! Thanks for the fix.