Remove unused rustup.sh script

rustup.sh

@@ -1,29 +0,0 @@
-#!/usr/bin/env bash
-
-set -e
-
-case $1 in
-    "prepare")
-        TOOLCHAIN=$(date +%Y-%m-%d)
-
-        echo "=> Installing new nightly"
-        rustup toolchain install --profile minimal nightly-${TOOLCHAIN} # Sanity check to see if the nightly exists
-        echo nightly-${TOOLCHAIN} > rust-toolchain
-
-        echo "=> Uninstalling all old nightlies"
-        for nightly in $(rustup toolchain list | grep nightly | grep -v $TOOLCHAIN | grep -v nightly-x86_64); do
-            rustup toolchain uninstall $nightly
-        done
-
-        ./y.sh clean all
-        ./y.sh prepare
-        ;;
-    "commit")
-        git add rust-toolchain
-        git commit -m "Rustup to $(rustc -V)"
-        ;;
-    *)
-        echo "Unknown command '$1'"
-        echo "Usage: ./rustup.sh prepare|commit"
-        ;;
-esac