feat: Flat import of markdown repo

This is a flat (without history) import of (some of) the content
from our markdown module.

We've imported this without history because the repo contains our
blog posts and showcases posts content prior to porting them to strapi.

Since this contains many images, it would balloon the size of this repo
to import the full history.

Instead, please refer to the history of the (archived) markdown repo
at: https://github.com/freesewing/markdown

markdown/dev/editors/howtos/blogpost/create-file/en.md

@@ -0,0 +1,14 @@
+---
+title: Create a new file for the blog post
+order: 20
+---
+
+In the folder you just created, create a new empty file, and name it `en.md`.
+
+<Note>
+
+While we support translation, we do not support adding original content in
+any language other than English. This is why the file **must** be named
+`en.md` and be written in English.
+
+</Note>