Stack theme has a built-in support for image galleries. It allows you to create a beautiful gallery by simply placing multiple images side-by-side.
Sample Gallery


How it works
The gallery is powered by Photoswipe and a custom internal script. It automatically calculates the best layout for your images based on their aspect ratios.
To create a gallery, you just need to put multiple images in the same line (or paragraph).
Syntax
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Note: There should be two spaces between the images to ensure they stay in the same line in Markdown
Gallery Syntax inspired by Typlog