[neovim] Try to get rid of astro warnings. [shell] Adds comma for Nix.

home-manager/features/shell.nix

@@ -11,10 +11,13 @@
   # a system or working with other shell commands.  Packages more specific to
   # development can be in development configs.
   home.packages = with pkgs; [
+    # Package management
+    comma # Runs commands without having to install them
+
     # System
     htop
     btop
-    psmisc # fuser, killal, pstree
+    psmisc # fuser, killall, pstree
 
     # Session management
     tmux