Deprecate praqma/network-multitool

[TheDukeDK]

As of the creation date of this issue I am pretty sure that the praqma organization will be deprecated on docker hub.

Some of the advanced labs reference the praqma/network-multitool image.

The ownership of the image has been passed to previous Praqma employee and creator Kamran Azeem and the image is now called wbitt/network-multitool. The repository can be found here.

If we intend to continue to use the image in the advanced labs we should use the new maintained image here.