Simple script and config (type-safe) for building custom Linux kernels for Firecracker MicroVMs

fix: remove outdated feature mention for architecture support in README

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README.md
··· 8 8 ## ✨ Features 9 9 10 10 - Builds any stable Linux kernel version (e.g., `6.1`, `6.1.12`, `6.1.y`) 11 - - Supports multiple architectures (x86_64, aarch64) 12 11 - Enhanced kernel configuration handling with customizable options 13 12 - Uses a custom `.config` for reproducible builds 14 13 - Outputs a ready-to-use `vmlinux-X.Y-[arch]` file