Updating changelog; update version to v2.9.0; added release bash scri…

…pt for automating releases (WIP)

v2.8.0-alpha.1 🚀

minifying 2.7.0

Merge pull request usablica#730 from usablica/afshinm-release-v2.6.0

v2.6.0

adding scrollbar to docs sidebar

v2.3.0 🚀

2.2.1

adding latest builds