Version 1.0!

Welcome to the first major release of the Vulnerability History Project!

Testing out Zenodo

Article update, artwork update (#822)

Closes #680 

Contributes to #503 

* a bunch of new images for forthcoming articles
* discovery tagger tweak
* welcome page shouldn't use markdown on subtitle
* rework the show page
* Add slugs to articles
* update tests
* implement draft functionality for articles