Moved changelog2markdown.sh into website repo.

dev/scripts/changelog2markdown.sh

-#!/bin/sh
-# Author: Johannes Zarl-Zierl <johannes@zarl-zierl.at>
-# I do not consider this shell snippet to be copyrightable.
-# If you need to put a license on it, please go ahead. For questions, please do contact me via email.
-
-BUGZILLA=https://bugs.kde.org/
-
-echo "--Paste Changelog entries here--" >&2
-sed \
-"
- s/^\W*\* \([^:]*:\)/ - **\1**/  ### Replace asterisk with dash, make classifier (Bug|Change|Deprecateion|etc.) **bold**
- s_\#\([0-9]*\)_[#\1]($BUGZILLA\1)_g ### Replace #1234 with link to bugzilla
-"