treewide: use mkEnableOption with overrides over mkOption

cli/git.nix

@@ -13,11 +13,8 @@ in
   options.nixowos.cli.${name} = {
     enable = lib.mkEnableOption name;
 
-    delta.enable = lib.mkOption {
+    delta.enable = lib.mkEnableOption "delta within git" // {
       default = true;
-      example = false;
-      description = "Whether to enable delta within git.";
-      type = lib.types.bool;
     };
   };
 

graphical/mpv.nix

@@ -15,11 +15,9 @@ in
 
     package = lib.mkPackageOption pkgs name { };
 
-    useFullFFmpeg = lib.mkOption {
-      type = lib.types.bool;
-      default = false;
+    useFullFFmpeg = lib.mkEnableOption "ffmpeg-full within mpv" // {
       description = ''
-        Use pkgs.ffmpeg-full within mpv, for more media support.
+        Whether to use pkgs.ffmpeg-full within mpv, for more media support.
         For instance, this makes jxl viewing and screenshots possible.
 
         However, this will (almost certainly) require a local compilation of mpv

graphical/plasma.nix

@@ -13,9 +13,7 @@ in
   options.nixowos.graphical.${name} = {
     enable = lib.mkEnableOption name;
 
-    startOnFirstTTY = lib.mkOption {
-      type = lib.types.bool;
-      default = false;
+    startOnFirstTTY = lib.mkEnableOption "starting plasma from tty1" // {
       description = ''
         Whether to start ${name} automatically from tty1.