Offer to deactivate navis-documentcloud plugin if installed

[paulschreiber]

Currently, if the Navis DocumentCloud plugin is installed, DC displays a warning:

You have two conflicting DocumentCloud plugins activated. Please deactivate Navis DocumentCloud, which has been replaced by DocumentCloud.

In addition to displaying the warning, offer to deactivate the plugin.

Docs: https://developer.wordpress.org/reference/functions/deactivate_plugins/

[reefdog]

I like that. Any chance you want to take a crack at it? Otherwise I'll get to it next time I'm able.