Develop an NHSbuntu icon theme

[pacharanero]

It would be a nice enhancement to have our own NHSbuntu icon theme, perhaps based on some of the very nice Linux Mint ones, but colour-tweaked to match the blue NHSbuntu theme we've chosen.

[pacharanero]

a fork of the Limux Mint blue icon theme would do nicely:
https://github.com/linuxmint/mint-x-icons/tree/master/usr/share/icons/Mint-X-Blue