electronplayer: drop

ElectronPlayer had been unmaintained and its repository archived since October 28, 2024.

It evidently had already been struggling to function for years, judging by [the section titled
"The Pain of Widevine"](https://github.com/oscartbeaumont/ElectronPlayer/blob/master/README.md#the-pain-of-widevine) 
in its README file, and the last commit dates from October 9, 2021, over three years before the
repository was archived.

All in all, it is a dead project that had been broken for years, and we shouldn't continue to
support it in 25.05.

Author: pluiedev

pkgs/applications/video/electronplayer/electronplayer.nix

@@ -327,6 +327,7 @@ mapAliases {
 
   edUnstable = throw "edUnstable was removed; use ed instead"; # Added 2024-07-01
   elasticsearch7Plugins = elasticsearchPlugins;
+  electronplayer = throw "'electronplayer' has been removed as it had been discontinued upstream since October 2024"; # Added 2024-12-17
 
   element-desktop-wayland = throw "element-desktop-wayland has been removed. Consider setting NIXOS_OZONE_WL=1 via 'environment.sessionVariables' instead"; # Added 2024-12-17
 

pkgs/top-level/aliases.nix

@@ -2277,8 +2277,6 @@ with pkgs;
 
   eddy = libsForQt5.callPackage ../applications/graphics/eddy { };
 
-  electronplayer = callPackage ../applications/video/electronplayer/electronplayer.nix { };
-
   element-web = callPackage ../by-name/el/element-web/package.nix {
     conf = config.element-web.conf or { };
   };