experiment: Leave initramfs

Added experiment on booting past initramfs. It uses Makefile to build initramfs.

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diff --git a/experiments/03_20251130_leaving_initramfs/README b/experiments/03_20251130_leaving_initramfs/README
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+Goal: boot into initramfs and switch to real system
+Status: success
+
+Added busybox to the mix, incredibely useful here
+
+init script will create new_root, mount tmpfs there and copy all the binaries
+from initramfs to it so we have something to work with. It'll also mount /proc,
+/dev and /sys. After that's done it'll switch root and run busybox shell as new
+PID 1.
+
+there's a /new_root/cake file created by the script to confirm that we indeed
+changed the root
+
+Useful resources:
+- https://github.com/torvalds/linux/blob/v4.17/Documentation/filesystems/ramfs-rootfs-initramfs.txt
+- https://www.kernel.org/doc/html/latest/admin-guide/initrd.html (obsolete but useful)
+
+Package list:
+busybox-static_1.37.0-7_amd64.deb
+dash_0.5.12-12_amd64.deb
+gcc-14-base_14.2.0-19_amd64.deb
+libblkid1_2.41.2-4_amd64.deb
+libc6_2.41-12_amd64.deb
+libc-bin_2.41-12_amd64.deb
+libgcc-s1_14.2.0-19_amd64.deb
+libmount1_2.41.2-4_amd64.deb
+libpcre2-8-0_10.47-2_amd64.deb
+libselinux1_3.9-4_amd64.deb
+libsmartcols1_2.41.2-4_amd64.deb
+mount_2.41.2-4_amd64.deb
+util-linux_2.41.2-4_amd64.deb
+