chore: update machine translation screenshot from png to webp format (#1008)

Author: dzienisz

platform/translation_process/machine_translation.mdx

@@ -26,6 +26,6 @@ Machine translation suggestions are available in the translation editor.
 Note that only the machine translation providers **enabled by the project administrator** will be displayed.
 
 <ScreenshotWrapper
-  src="/img/docs/platform/machine-translation.png"
+  src="/img/docs/platform/machine-translation.webp"
   alt="Machine translation suggestions"
 />