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/hypr/hyprsunset.conf

@@ -0,0 +1,12 @@
+# Makes hyprsunset do nothing to the screen by default
+# Without this, the default applies some tint to the monitor
+profile {
+    time = 07:00
+    identity = true
+}
+
+# Enable auto switch to nightlight:
+# profile {
+#     time = 20:00
+#     temperature = 4000
+# }