Lighbox for Image

### Is there an existing issue for this?

- [x] I have searched the existing issues

### What feature should be added?

Image lightbox

### What is the expected behavior?

Clicking on image should open up an pop-up window that overlays the rest of the page, with full width and height

### How will this feature improve the user experience?

Improve the image visibility, readability

### What would a solution for this issue look like?

using any open source library like lightbox.js etc.

No file or test is named. Start by locating the documentation site's image-rendering entry point and checking how frontend assets are built, then evaluate a lightbox.js-style library. Done means clicking an image opens a full-width, full-height overlay that improves image readability.

Written by the indexing model from the issue text.