Fix layout shifts by preserving aspect-ratio at responsive sizes

Uses `aspect-ratio` property to constrain height and width of render image's container to allow responsive resizing
while maintaining the original aspect ratio and avoiding layout shifts.

Previously, even though `width` and `height` attributes were passed to the `img` element, Chrome (and probably others)
weren't reserving space for the image as expected because CSS `width`/`height` were both `auto`. At least one of them
needed to be a fixed value in order to maintain aspect ratio. Even with this change, it doesn't seem possible to
constrain both width and height on the same element at the same time — only one or the other works.

The change introduced makes the `img` element constrain width using `max-width` while the parent element constrain
height using `max-height` and `aspect-ratio`. This way, we can get responsive sizing on both axes while obeying the
constraints.

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