Immanuel/nnn: My build of nnn with minor changes - nnn

My build of nnn with minor changes

lvgx 1a78ad4aff Add a logo for nnn (n³) (#544 ) "n³" on a black knight chess piece/black horse head.		4 lat temu
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logo-64x64.png	Add a logo for nnn (n³) (#544)	4 lat temu
logo-128x128.png	Add a logo for nnn (n³) (#544)	4 lat temu
logo.svg	Add a logo for nnn (n³) (#544)	4 lat temu