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/settings/margin/en.md

@@ -0,0 +1,31 @@
+--- 
+title: margin
+---
+
+Allows you to specify a part margin (in mm). The default is 2mm.  
+Each part will have this margin applied. This means that:
+
+ - At the edge of the SVG, the margin will be `margin * 1` (2mm by default)
+ - Between parts, the margin will be `margin * 2` (4mm by default)
+ 
+Note that setting the margin to zero (or below) will cause parts to overlap.
+
+```js
+import brian from "@freesewing/brian";
+
+let pattern = new brian({
+  margin: 5
+})
+```
+
+<Note>
+
+###### For paperless, the minimal margin is 10mm
+
+In paperless mode, the margin will not go below 10mm. 
+
+That is because text is not taken into account when calculating the bounding box of the part.
+Since dimensions are typically the outermost elements in a paperless part, 
+a too narrow margin would cause the dimension text to get cut off.
+
+</Note>