The browser uses the `width` and `height` attributes of the image tag to
allocate space on the page for the image.
If these aren’t provided then the browser will assume the image takes up
no space, until it’s downloaded it and had a look at what the file’s
dimensions are. This causes the layout of the page to jump once the
image downloads.
`149 × 150px` is the native size of the image. But we don’t want it to
display at that size, so this commit also adds some extra CSS which
keeps it looking the same, namely:
- the full width of the 1/4 page column on desktop
- the full width of the column minus a `40px` gutter either side on
mobile (by using `box-sizing: border-box` the `40px` of padding is
subtracted from the 100% width, rather than added to it)
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