✨ (facets) reduce grid padding

[sophiamersmann]

Makes row and column padding of facet grids tighter. This gives more room to charts, esp. on mobile. Desktop grids are tighter too. I think that's okay but we could fine-tune by doing special sizing for different breakpoints.

Example chart: https://ourworldindata.org/grapher/deaths-caused-by-vaccine-preventable-diseases-over-time

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