updated flake.lock, reverted zig packages to unstable, switched ereader, added nix-index

homes/modules/programs/neovim/nixcats.nix

@@ -2,7 +2,6 @@
 # https://github.com/BirdeeHub/nix-wrapper-modules
 {
   inputs,
-  spkgs,
   mpkgs,
   ...
 }:
@@ -75,7 +74,7 @@ in
                 inputs.fenix.packages.${system}.complete.rustfmt
               ];
               zig = [
-                spkgs.zls # FIX: using spkgs version as zls is broken rn ;-;
+                zls
               ];
               elixir = [
                 elixir-ls