Auto zoom on namespace

[chevdor]

Opening a cluster shows lots of content. it would be very handy:

• seeing the list of resources (namespaces, etc...)
• being able to zoom in to a resource from that tree
• being able to zoom in a namespace by double clicking on it

This issues is similar to #26 to allow a smooth initial experience.

very exciting project btw :)

[mo-othman]

Thanks @chevdor we are happy to hear you that you find it exciting