docs: create rendering images page

docs/page/content/docs/rendering-images.md

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+---
+title: "Rendering Images"
+weight: 5
+prev: /docs/using-with-livewire
+---
+
+You can also use Axis to render charts directly on the server as images - to use them on emails, notifications or exporting to external services. It uses the same syntax as client-side rendered charts, so all your charts are interactive and exportable!
+
+### Requirements
+
+Axis uses [Node](https://nodejs.org/en) and [Puppeteer](https://pptr.dev/guides/installation) under the hood, so both need to be installed and accessible to the system's webserver user.
+
+### Usage
+
+After creating your chart, you can call `toPng()`, `toWebp()` or `toJpeg()` to generate an screenshot of the chart and get it's contents. After that, you can save it on storage, for instance:
+
+```php
+class ExampleController extends Controller
+{
+    public function __invoke(): View
+    {
+        $chart = Chart::chartjs()
+            ->column()
+            ->labels(['Red', 'Blue', 'Yellow', 'Green', 'Purple', 'Orange'])
+            ->series('# of Votes', [12, 19, 3, 5, 2, 3], ['borderWidth' => 1])
+            ->options(['scales' => [
+                'y' => ['beginAtZero' => true],
+            ]]);
+
+        Storage::put('chartjs.png', $chart->toPng());
+    }
+}
+```
+
+You can also set the Node binary path if needed:
+
+```php
+$image = $chart->setNodeBinary('/usr/local/bin/node')->toPng();
+
+Storage::put('chartjs.png', $image);
+```
+
+It is _that_ easy!