feat(nvim/lsp): enabling some LSPs

kat/users/neovim/default.nix

@@ -95,6 +95,20 @@ with lib;
         };
 
         web-devicons.enable = true;
+
+        lsp = {
+          enable = true;
+          servers = {
+            nixd.enable = true;
+            pylsp.enable = true;
+            clangd.enable = true;
+            rust_analyzer = {
+              enable = true;
+              installCargo = true;
+              installRustc = true;
+            };
+          };
+        };
       };
     };
   };