flake: add symlink for needed packages in overlay

flake.nix

@@ -12,7 +12,6 @@
     supportedSystems = ["x86_64-linux" "aarch64-linux"];
     forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
     nixpkgsFor = forAllSystems (system: import nixpkgs {inherit system;});
-    pkgs = nixpkgs.legacyPackages.x86_64-linux.pkgs;
   in {
     packages = forAllSystems (system: let
       pkgs = nixpkgsFor.${system};
@@ -43,6 +42,32 @@
       };
     });
 
+    overlays = forAllSystems (system: let
+      pkgs = nixpkgsFor.${system};
+    in {
+      overlay = final: prev: {
+        nvim = pkgs.symlinkJoin {
+          name = "nvim";
+          paths = with pkgs;
+            [
+              alejandra
+              ccls
+              gopls
+              luaformatter
+              nixd
+              pyright
+              rust-analyzer
+              sumneko-lua-language-server
+              svls
+              texlab
+              tree-sitter
+              verible
+              zls
+            ]
+            ++ [self.packages.${system}.nvim];
+        };
+      };
+    });
     defaultPackage = forAllSystems (system: self.packages.${system}.nvim);
   };
 }