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

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

@@ -0,0 +1,49 @@
+---
+title: rmd
+---
+
+The `rmd` macro removes a dimension.
+It is provided by the [dimension plugin](/reference/plugins/dimension/).
+
+To be able to use this plugin, you need to give your dimension an id:
+
+## Signature
+
+```js
+macro('rmd', { 
+  String id
+})
+```
+
+## Example
+
+<Example caption="An example of the rmd macro">
+```js
+({ Point, macro, part }) => {
+
+  macro('ld', {
+    from: new Point(10, 0),
+    to: new Point(40, 0),
+    d: 5,
+    id: 'da',
+  })
+
+  macro('ld', {
+    from: new Point(10, 20),
+    to: new Point(80, 20),
+    d: 5,
+    id: 'db',
+  })
+
+  macro('rmd', { id: 'db' })
+
+  return part
+}
+```
+</Example>
+
+## Configuration
+
+| Property | Default | Type     | Description |
+|----------|---------|----------|-------------|
+| `id`     |         | `string` | The id of the dimension to remove |