Move to unstable nixpkgs only

config.nix

@@ -1,4 +1,4 @@
-{ pkgs, pkgs-unstable, inputs, ... }:
+{ pkgs, inputs, ... }:
 {
   colorschemes.tokyonight.enable = true;
 
@@ -153,7 +153,7 @@
       enable = true;
       settings = {
         server = {
-          cmd = [ "${pkgs-unstable.rust-analyzer}/bin/rust-analyzer" ];
+          cmd = [ "${pkgs.rust-analyzer}/bin/rust-analyzer" ];
         };
       };
     };