apple/t2: update docs to remove old option

The option was removed in a previous PR but the README was not updated.
Reduce confusion by removing references to the deleted option.

apple/t2/README.md

@@ -8,29 +8,5 @@ Following [this guide](https://wiki.t2linux.org/distributions/nixos/installation
 
 You can consult the [wiki](https://wiki.t2linux.org/) for information specific to T2 Macs.
 
-## Unlocking Internal iGPU
+> [!warning]
-
+> Always ensure compatibility and make backups of your data before making any system changes.
-The `apple-set-os-loader-installer` module serves as an installer for the [`apple-set-os-loader`](https://github.com/Redecorating/apple_set_os-loader). This tool is designed to unlock the internal integrated GPU (iGPU) on certain MacBooks. See https://wiki.t2linux.org/guides/hybrid-graphics/ for more details.
-
-### What it Does:
-
-Upon activation, this module performs the following:
-
-- Renames the existing `BOOTX64.EFI` file to `bootx64_original.efi`.
-- Installs the `apple-set-os-loader` hook in its place as `bootx64.efi`.
-- Before the system boots the hook unlocks the iGPU and subsequently calls the original `bootx64_original.efi`.
-- Enables the iGPU by default.
-
-### How to Implement:
-
-1. Add this into your `configuration.nix`:
-```
-hardware.apple-t2.enableAppleSetOsLoader = true;
-```
-
-2. **Rebuild your system**:
-```
-sudo nixos-rebuild switch
-```
-
-> **Note**: Always ensure compatibility and make backups of your data before making any system changes.