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/utils/circlesintersect/en.md

@@ -0,0 +1,62 @@
+---
+title: circlesIntersect()
+---
+
+```js
+array | false utils.circlesIntersect(
+  Point centerA, 
+  float radiusA, 
+  Point centerB, 
+  float radiusB, 
+  string sort = 'x'
+)
+```
+
+Finds the intersections between two circles described by their center point and radius.
+
+The 5th and last parameter controls the *sorting* of the found intersections.
+When this returns 2 intersections, you can choose how they are ordered in the returned array:
+
+Set sort to:
+
+ - `x` : The point with the lowest X-coordinate will go first (left to right)
+ - `y` : The point with the lowest Y-coordinate will go first (top to bottom)
+
+<Example part="utils_circlesintersect" caption="A Utils.circlesIntersect() example" />
+
+```js
+let { Point, points, Snippet, snippets, utils } = part.shorthand();
+
+points.A = new Point(10, 10)
+  .attr("data-circle", 15)
+  .attr("data-circle-class", "fabric");
+points.B = new Point(30, 30)
+  .attr("data-circle", 35)
+  .attr("data-circle-class", "fabric");
+points.C = new Point(90, 10)
+  .attr("data-circle", 15)
+  .attr("data-circle-class", "various");
+points.D = new Point(110, 30)
+  .attr("data-circle", 35)
+  .attr("data-circle-class", "various");
+
+let intersections1 = utils.circlesIntersect(
+  points.A,
+  points.A.attributes.get("data-circle"),
+  points.B,
+  points.B.attributes.get("data-circle")
+);
+let intersections2 = utils.circlesIntersect(
+  points.C,
+  points.C.attributes.get("data-circle"),
+  points.D,
+  points.D.attributes.get("data-circle"),
+  "y"
+);
+
+snippets.first1 = new Snippet("bnotch", intersections1[0]);
+snippets.second1 = new Snippet("notch", intersections1[1]);
+snippets.first2 = new Snippet("bnotch", intersections2[0]);
+snippets.second2 = new Snippet("notch", intersections2[1]);
+```
+