Create content for a blog post for the section "Some roles and directives on Nikola via Myst"

[damianavila]

The idea of this ticket is to track the creation of content and eventually publish a blog post about some roles and directives on Nikola via Myst.
Check #14 if you need a bigger context.

The proposed outline looks like this (for now, this is evolving content):

Some roles and directives on Nikola via Myst

Showcase a simple role or directive implementation via the Python API.

Showcase the JS alternative through templating via markdown-it-docutils (and maybe markdown-it-myst?)

Steps:

• Create a draft
• Revisit the draft
• Publish and ANN