[Altair] Adds Thunderbird email, protonmail bridge. [Nix] Fixes deprecated expressions

system/hosts/altair/drew.nix

@@ -17,6 +17,7 @@ in
       "/features/development/typescript.nix"
       "/features/development/vscode.nix"
       "/features/eww"
+      "/features/email.nix"
       "/features/gaming.nix"
       "/features/image-editing.nix"
       "/features/linux-desktop.nix"
@@ -38,9 +39,11 @@ in
   home.username = "drew";
   home.homeDirectory = "/home/drew";
 
-  programs.git = {
-    userName = "Drew Haven";
-    userEmail = "drew.haven@gmail.com";
+  programs.git.settings = {
+    user = {
+      name = "Drew Haven";
+      email = "drew.haven@gmail.com";
+    };
   };
 
   wayland.windowManager.hyprland.settings = {