VS 2.0.0

This update removes Gulp4, outdated npm dependencies that are no longer maintained and had vulnerabilities.
These scripts are replaced by postcss scripts and plugins.

Scénarimages/FilmStoryboards no longer uses browser-sync for now we replace it with Jekyll --livereload command.

VS 1.0.0

Initial commit
Scénarimages/FilmStoryboards theme VS 1.0.0