This makes future refactoring easier, since the elements will
retain their borders even if the hierarchy changes.
Also round some maps and the legale section since I think those now
look nicer.
This prevents reflow when the images are loaded by the browser.
ActiveStorage variants are resized lazily when the image is requested,
so we only know the dimensions if the image was already loaded. This
means that there will be one reflow just after a new avatar is first
viewed.
