Remove setup.sh

It isn't used anywhere

setup.sh

@@ -1,20 +0,0 @@
-#!/usr/bin/env bash
-set -e
-
-echo "Downloading latest pkgutils"
-git submodule update --init --remote pkgutils
-cargo update --manifest-path pkgutils/Cargo.toml
-
-echo "Defaulting to rust nightly"
-rustup override set nightly
-echo "Update rust nightly"
-rustup update nightly
-echo "Downloading rust source"
-rustup component add rust-src
-if [ -z "$(which cargo-config)" ]
-then
-    echo "Installing cargo-config"
-    cargo install -f cargo-config
-fi
-
-echo "cook.sh is ready to use"