chore(markdown): Move non-api docs to reference

markdown/dev/reference/macros/bartack/en.md

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+---
+title: bartack
+---
+
+The `bartack` macro allows you to add a _bartack_ marker to your sewing
+pattern. It is provided by the [bartack plugin](/reference/plugins/bartack/).
+
+## Signature
+
+```js
+macro('banner', {
+  Point anchor,
+  Number angle=0,
+  Number density=3,
+  Number length=15,
+  String prefix='',
+  String suffix='',
+  Number width=3,
+})
+```
+
+## Example
+
+<Example caption="Example of the bartack macro">
+```js
+({ macro, Point, part }) => {
+
+  macro('bartack', {
+    anchor: new Point(0,0),
+    length: 25
+  })
+
+  return part
+}
+```
+</Example>
+
+## Configuration
+
+| Property     | Default    | Type       | Description |
+|-------------:|------------|------------|-------------|
+| `anchor`     |            | `Point`    | The point to start the bartack from |
+| `angle`      | `0`        | `number`   | The angle under which to draw the bartack |
+| `density`    | `3`        | `number`   | Controls how close the stitches are togeter |
+| `length`     | `15`       | `number`   | Length of the bartack |
+| `prefix`     |            | `string`   | A prefix to apply to the names of the generated path and points |
+| `suffix`     |            | `string`   | A suffix to apply to the names of the generated path and points |
+| `width`      | `3`        | `number`   | Width of the bartack |