Add blog section

[sdepold]

I think it would be cool to add a blog section where we can post bigger updates from time to time. From the top of my head I can think of the following posts:

• Upgrade guide from v6 to v7
• Documentation about introduction of @sequelize scope
• Share roadmap with the world

[WikiRik]

https://docusaurus.io/docs/blog

[ephys]

I'm still deep in the refactoring of the project for the initial release but I'll try to take the time to write a post or two to present new shiny features once we get there