Add wallpaper for ThinkPad, improve wallpaper management

hosts/default.nix

@@ -33,6 +33,7 @@ in
               (import ./home.nix)
               (import ./thinkpads/home.nix)
             ];
+            home.file."./.background-image".source = ../wallpapers/178869_1366x768.jpg;
           };
         };
       }
@@ -60,6 +61,7 @@ in
               (import ./home.nix)
               (import ./thinkpads/home.nix)
             ];
+            home.file."./.background-image".source = ../wallpapers/roxynord.png;
           };
         };
       }
@@ -86,6 +88,7 @@ in
               (import ./home.nix)
               (import ./virtualbox/home.nix)
             ];
+            home.file."./.background-image".source = ../wallpapers/roxynord.png;
           };
         };
       }

hosts/home.nix

@@ -9,7 +9,6 @@ in
     ../vim.nix
     ../ranger.nix
     ../fcitx5.nix
-    ../wallpaper.nix
     ../picom.nix
     ../i3.nix
     ../polybar
@@ -60,6 +59,7 @@ in
       firefox
       discord
       gnome.nautilus
+      gimp
     ];
   };
 

wallpaper.nix

@@ -1,7 +0,0 @@
-{ ... }:
-
-{
-  home.file."./.background-image" = {
-    source = ./roxynord.png;
-  };
-}

wallpapers/README.md

@@ -0,0 +1 @@
+Numeric post IDs are [konachan.net](https://konachan.net) post IDs, e.g. [https://konachan.net/post/show/178869](https://konachan.net/post/show/178869). Sources will otherwise be listed here if available.