Move nvtop to GPU-specific package lists; clean up git-bible

nvtop pulled nvidia-tesla-470-* via Recommends into the nogpu build.
Move it from bee.list.chroot into bee-nvidia and bee-amd lists so it
only appears in GPU variants.

Also remove the stray git-bible/ directory (was not gitignored) and
move grub-bitmap-error docs into bible-local/docs/.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

iso/builder/config/package-lists/bee.list.chroot

@@ -47,7 +47,6 @@ less
 vim-tiny
 mc
 htop
-nvtop
 sudo
 zstd
 mstflint