pinwheel: Rename Emacs theme to sodium

hosts/pinwheel/modules/emacs/default.nix

@@ -35,7 +35,7 @@ in
       TIG_EDITOR = "${e}/bin/e $@";
     };
 
-    home.file.".emacs.d/doom-submarine-theme.el".source = ./doom-submarine-theme.el;
+    home.file.".emacs.d/sodium-theme.el".source = ./sodium-theme.el;
 
     home.packages = [
       e