docs(v3.5.0): update README for integrated mg_dotfiles and security improvements

- Integrated mg_dotfiles as regular directory (not submodule)
- Added .zshrc.local.example template for local configs without secrets
- Added mg_dotfiles/zsh/.zshrc.local to .gitignore to protect API keys
- Updated README to reflect mg_dotfiles integration and new structure
- Added nvim configuration directory with LazyVim setup

mg_dotfiles/nvim/lua/plugins/disabled.lua

@@ -0,0 +1,46 @@
+-- This file contains the configuration for disabling specific Neovim plugins.
+
+return {
+  {
+    -- Plugin: bufferline.nvim
+    -- URL: https://github.com/akinsho/bufferline.nvim
+    -- Description: A snazzy buffer line (with tabpage integration) for Neovim.
+    "akinsho/bufferline.nvim",
+    enabled = false, -- Disable this plugin
+  },
+  {
+    -- Plugin para mejorar la experiencia de edición en Neovim
+    -- URL: https://github.com/yetone/avante.nvim
+    -- Description: Este plugin ofrece una serie de mejoras y herramientas para optimizar la edición de texto en Neovim.
+    "yetone/avante.nvim",
+    enabled = false,
+  },
+  {
+    "CopilotC-Nvim/CopilotChat.nvim",
+    enabled = false,
+  },
+  {
+    "NickvanDyke/opencode.nvim",
+    enabled = true,
+  },
+  {
+    "olimorris/codecompanion.nvim",
+    enabled = false,
+  },
+  {
+    "tris203/precognition.nvim",
+    enabled = false,
+  },
+
+  {
+    "sphamba/smear-cursor.nvim",
+    enabled = false,
+  },
+  {
+    -- Plugin: claude-code.nvim
+    -- URL: https://github.com/greggh/claude-code.nvim
+    -- Description: Neovim integration for Claude Code AI assistant
+    "coder/claudecode.nvim",
+    enabled = false,
+  },
+}