Blog post categories based on folders

[BenSchZA]

Hi @davidroyer ! I'm really glad I came across your work with the markdown-it library.

I've made a few changes and included them in my repo on a branch: https://github.com/BenSchZA/nuxtjs-benjaminscholtz.com/tree/markdown-blog

The changes basically allow you to organise your posts by category, like /blog/:category/:post, where the category is extracted from the directory structure where the markdown files are stored.

When I'm ready I could submit a pull request, or rather include a link to it in your readme?

Cheers.