docs(guide): document script logging

docs/User Guide/User Guide/Scripting/Logging.md

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+# Logging
+Both front-end and back-end notes can log messages for debugging.
+
+## UI logging via `api.log`
+
+<figure class="image image_resized image-style-align-center" style="width:57.74%;"><img style="aspect-ratio:749/545;" src="Logging_image.png" width="749" height="545"></figure>
+
+The API log feature integrates with the script editor and it displays all the messages logged via `api.log`. This works for both back-end and front-end scripts.
+
+The API log panel will appear after executing a script that uses `api.log` and it can be dismissed temporarily by pressing the close button in the top-right of the panel.
+
+Apart from strings, an object can be passed as well in which case it will be pretty-formatted if possible (e.g. recursive objects are not supported).
+
+## Console logging
+
+For logs that are not directly visible to the user, the standard `console.log` can be used as well.
+
+*   For front-end scripts, the log will be shown in the Developer Tools (also known as Inspect).
+*   For back-end scripts, the log will be shown in the server output while running but **will not** be visible in the <a class="reference-link" href="../Troubleshooting/Error%20logs/Backend%20(server)%20logs.md">Backend (server) logs</a>.