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/omarchy/alacritty/alacritty.toml

@@ -0,0 +1,21 @@
+general.import = [ "~/.config/omarchy/current/theme/alacritty.toml" ]
+
+[env]
+TERM = "xterm-256color"
+
+[font]
+normal = { family = "CaskaydiaMono Nerd Font" }
+bold = { family = "CaskaydiaMono Nerd Font" }
+italic = { family = "CaskaydiaMono Nerd Font" }
+size = 9
+
+[window]
+padding.x = 14
+padding.y = 14
+decorations = "None"
+
+[keyboard]
+bindings = [
+{ key = "Insert", mods = "Shift", action = "Paste" },
+{ key = "Insert", mods = "Control", action = "Copy" }
+]