feat(markdown): Added docs for new core methods

markdown/dev/reference/api/snippet/rotate/en.md

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+---
+title: Snippet.rotate()
+---
+
+The `Snippet.rotate()` method allows you to scale a snippet. Under the hood, it
+sets the `data-rotate` property.
+
+## Signature
+
+```js
+Snippet snippet.rotate(rotation, overwrite=true)
+```
+
+<Tip compact>This method is chainable as it returns the `Snippet` object</Tip>
+
+## Example
+
+<Example caption="An example of the Snippet.rotate() method">
+```js
+({ Point, Path, paths, Snippet, snippets, part }) => {
+
+  for (const i of [0,1,2,3,4,5,6]) {
+    snippets[`demo${i}`] = new Snippet(
+      "logo", 
+      new Point(60*i, 0)
+    ).rotate(60 * i)
+  }
+
+  // Prevent clipping
+  paths.diag = new Path()
+    .move(new Point(-30,-50))
+    .move(new Point(400,50))
+
+  return part
+}
+```
+</Example>
+

markdown/dev/reference/api/snippet/scale/en.md

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+---
+title: Snippet.scale()
+---
+
+The `Snippet.scale()` method allows you to scale a snippet. Under the hood, it
+sets the `data-scale` property.
+
+## Signature
+
+```js
+Snippet snippet.scale(scale, overwrite=true)
+```
+
+<Tip compact>This method is chainable as it returns the `Snippet` object</Tip>
+
+## Example
+
+<Example caption="An example of the Snippet.clone() method">
+```js
+({ Point, Path, paths, Snippet, snippets, part }) => {
+
+  for (const i of [1,2,3,4,5,6]) {
+    snippets[`demo${i}`] = new Snippet(
+      "logo", 
+      new Point(30*i, 0)
+    ).scale(i/10)
+  }
+
+  // Prevent clipping
+  paths.diag = new Path()
+    .move(new Point(0,-30))
+    .move(new Point(200,20))
+
+  return part
+}
+```
+</Example>
+