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/reference/api/pattern/svg/head/en.md

@@ -0,0 +1,35 @@
+---
+title: head
+---
+
+A string that combines the `style`, `script`,
+and `defs` sections and an opening tag for an SVG group.
+
+```svg
+<style type="text/css">
+  /* svg.style will be inserted */
+</style>
+
+<script type="text/javascript">
+  /* svg.script will be inserted */
+</scripts>
+
+<defs>
+  /* svg.defs will be inserted */
+</defs>
+
+<!-- Start of group #fs-container -->
+<g id="fs-container">
+```
+
+<Note>
+
+###### This does not include the opening SVG tag
+
+Note that while [Pattern.svg.tail](/reference/api/pattern/svg/tail/) closes the SVG tag, 
+[Pattern.svg.head](/reference/api/pattern/head/) does not open it. 
+That's because the `width`, `height` and `viewBox` attributes will
+depend on the main body of the SVG document.
+
+</Note>
+