Screenshots too hard to read

**Your Godot version:** stable

**Issue description:**
The inline screenshots throughout the docs are scaled down too much to be able to see clearly, especially smaller UI elements. Adding a lightbox modal that shows the full-sized screenshot on click would greatly improve readability.

**URL to the documentation page (if already existing):** https://docs.godotengine.org/en/stable/getting_started/step_by_step/intro_to_the_editor_interface.html