Upgrade to nixos and home-manager to version 25.11

modules/home-manager/git.nix

@@ -6,9 +6,9 @@
 
   programs.git = {
     enable = true;
-    userName = "Leonhard Kost";
-    userEmail = "leonhard.kost@gmail.com";
-    extraConfig = {
+    settings = {
+      user.name = "Leonhard Kost";
+      user.email = "leonhard.kost@gmail.com";
       credential.credentialStore = "cache";
       credential.helper = "manager";
     };

modules/home-manager/nixvim/plugins/cmp.nix

@@ -14,18 +14,17 @@
       lspkind = {
         enable = true;
 
-        cmp = {
-          enable = true;
-          menu = {
-            nvim_lsp = "[LSP]";
-            nvim_lua = "[api]";
-            path = "[path]";
-            luasnip = "[snip]";
-            buffer = "[buffer]";
+        settings = {
+          cmp = {
+            enable = true;
+            menu = {
+              nvim_lsp = "[LSP]";
+              nvim_lua = "[api]";
+              path = "[path]";
+              luasnip = "[snip]";
+              buffer = "[buffer]";
+            };
           };
-        };
-
-        extraOptions = {
           mode = "symbol";
         };
       };