remove swapfile script

The instructions have, for quite some time now, pointed users at the
`discourse-setup` script. That will prompt the user to create a swapfile
if necessary and configure relevant sysctls.

scripts/mk_swapfile

@@ -1,51 +0,0 @@
-#!/bin/bash -e
-# This script adds a 1GB swapfile to the system
-
-function do_err() {
-    code=$?
-    echo "Command failed with code $code: $BASH_COMMAND"
-    exit $code
-
-}
-trap do_err ERR
-
-
-function set_swappiness() {
-  if ! grep -q '^vm.swappiness' /etc/sysctl.conf; then
-    echo -n 'Setting '
-    sysctl -w vm.swappiness=10
-    echo vm.swappiness = 10 >> /etc/sysctl.conf
-  fi
-}
-
-function get_new_swapfile() {
-  for i in `seq 0 99`; do
-    if [ ! -e /swapfile.$i ]; then
-      echo /swapfile.$i
-      return
-    fi
-  done
-  # Seriously? 100 swapfiles already exist?
-  echo "too many swapfiles"
-  exit 1
-}
-
-[ `id -u` -eq 0 ] || { echo "You must be root to run this script"; exit 1; }
-
-# how big? default 1GB
-declare -i num_gb
-num_gb="${1-1}"
-[ $num_gb -lt 1 ] && { echo "Please specify an integer >= 1"; exit 1; }
-echo "Creating a ${num_gb}GB swapfile..."
-
-set_swappiness
-
-SWAPFILE=$(get_new_swapfile)
-
-umask 077
-dd if=/dev/zero of=$SWAPFILE bs=1k count=$(($num_gb * 1024 * 1024)) conv=excl
-mkswap $SWAPFILE
-swapon $SWAPFILE
-echo "$SWAPFILE swap swap auto 0 0" >> /etc/fstab
-
-echo 1GiB swapfile successfully added