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

home-manager/features/development/vscode.nix

@@ -3,7 +3,7 @@
   programs.vscode = {
     enable = true;
 
-    extensions = with pkgs.vscode-extensions; [
+    profiles.default.extensions = with pkgs.vscode-extensions; [
       asvetliakov.vscode-neovim # Use embedded neovim editor
       enkia.tokyo-night # Color theme
       eamodio.gitlens # Show git info inline