[ptg] Summaries blogpost

Hello everyone! Congrats to everyone on an awesome PTG week and thank you to everyone who submitted project recaps via the mailing list. I have collected all the posts and linked them to this blog post [1]. If you would still like to add a project summary feel free to reach out and I can get that added. Cheers, Helena [1] [ https://www.openstack.org/blog/xena-vptg-summaries/ ]( https://www.openstack.org/blog/xena-vptg-summaries/ )