Fixed aspect ratio for board game images

[janchaloupka]

I've made a simple CSS change for board game images (both grid and detail view) that allows the usage of non-square images.

This is done by using two CSS properties on the image itself:

• object-fit to resize the image to element while respecting its original aspect ratio
• aspect-ratio to make the DOM element square

Here is the fix in action (with random portrait image)