Move the Code Ocean best practices doc

[dbirman]

From here to explore_analyze/code_ocean.md

If you don't want to move it then just add a link pointing there I suppose?

[saskiad]

Is this a duplicate of #10

[dbirman]

Is this a duplicate of #10

The word documents are different.

I assume Tom can sort out which things should be kept, feel free to merge into one ticket if you'd prefer to sort it out together.