Añade guía de mdBook como referencia para PageTop

website/doc/src/format/theme/editor.md

@@ -0,0 +1,48 @@
+# Editor
+
+In addition to providing runnable code playgrounds, mdBook optionally allows them
+to be editable. In order to enable editable code blocks, the following needs to
+be added to the ***book.toml***:
+
+```toml
+[output.html.playground]
+editable = true
+```
+
+To make a specific block available for editing, the attribute `editable` needs
+to be added to it:
+
+~~~markdown
+```rust,editable
+fn main() {
+    let number = 5;
+    print!("{}", number);
+}
+```
+~~~
+
+The above will result in this editable playground:
+
+```rust,editable
+fn main() {
+    let number = 5;
+    print!("{}", number);
+}
+```
+
+Note the new `Undo Changes` button in the editable playgrounds.
+
+## Customizing the Editor
+
+By default, the editor is the [Ace](https://ace.c9.io/) editor, but, if desired,
+the functionality may be overridden by providing a different folder:
+
+```toml
+[output.html.playground]
+editable = true
+editor = "/path/to/editor"
+```
+
+Note that for the editor changes to function correctly, the `book.js` inside of
+the `theme` folder will need to be overridden as it has some couplings with the
+default Ace editor.