[nix] Add some more git configuration

nix/hosts/alymac/git.nix

@@ -1,4 +1,4 @@
-{ pkgs, dotfiles, ... }:
+{ pkgs, ... }:
 
 {
   programs.git = {
@@ -7,13 +7,24 @@
 
     userName = "Alyxia Sother";
     userEmail = "alyxia@riseup.net";
-
     signing = {
       key = "01E16C4E775A37E4";
       signByDefault = true;
     };
 
-    delta.enable = true;
+    delta = {
+      enable = true;
+      options = {
+        line-numbers = true;
+        features = "decorations";
+        syntax-theme = "ansi";
+      };
+    };
+
+    extraConfig = {
+      tag.gpgsign = true;
+      init.defaultBranch = "master";
+    };
   };
 
   programs.gitui.enable = true;