Use correct relative path for site_setup image

Author: Sneha-Goswami123

docs/mastering-plone/add-ons.md

@@ -150,9 +150,9 @@ An add-on can be enabled per Plone instance.
 In your browser, go to `Site Setup` at `http://localhost:3000/controlpanel`, and open the `Add-ons` Panel. You will see a list of available add-ons.
 
 ````{card}
-```{image} static/site_setup.png
+```{image} _static/site_setup.png
 :alt: Plone Site Setup control panel showing available configuration options
-:target: static/site_setup.png
+:target: _static/site_setup.png
 ```
 +++
 _Plone Site Setup control panel showing available configuration options._