Remove obsolete `sort_demos.sh` script

The Project Manager now sorts projects by name by default,
making this script redundant.

misc/scripts/sort-demos.sh

@@ -1,29 +0,0 @@
-#!/bin/bash
-# When scanning for demos, the project manager sorts them based on their
-# timestamp, i.e. last modification date. This can make for a pretty
-# messy output, so this script 'touches' each project.godot file in reverse
-# alphabetical order to ensure a nice listing.
-#
-# It's good practice to run it once before packaging demos on the build
-# server.
-
-if [ ! -d "demos" ]; then
-  echo "Run this script from the root directory where 'demos/' is contained."
-  exit 1
-fi
-
-if [ -e demos.list ]; then
-  rm -f demos.list
-fi
-
-for dir in 2d 3d gui misc viewport; do
-  find "demos/$dir" -name "project.godot" |sort >> demos.list
-done
-cat demos.list |sort -r > demos_r.list
-
-while read line; do
-  touch $line
-  sleep 0.2
-done < demos_r.list
-
-#rm -f demos.list demos_r.list