📄 Update project name, owner name and copyright year

LICENSE

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 To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively state the exclusion of warranty; and each file should have at least the “copyright” line and a pointer to where the full notice is found.
 
-     nix-config
-     Copyright (C) 2023  Jo
+     puzzlevision
+     Copyright (C) 2025 Johannes Reckers
 
      This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
 
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 If the program does terminal interaction, make it output a short notice like this when it starts in an interactive mode:
 
-     nix-config  Copyright (C) 2023  Jo
+     puzzlevision Copyright (C) 2025 Johannes Reckers
      This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
      This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details.