Add an "edit" mode

[everettraven]

Currently, buoy is a read only dashboard. In an effort to make buoy a more usable tool and prevent having to switch back and forth between buoy and kubectl, it should have a mode that can edit a particular resource (similar to how a resource can be viewed in the table panel). This should use the users default editor.

[everettraven]

Going to keep buoy as read-only dashboard for now