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Shrink icons and the share image, and name missing share links #235

Job	Run time
suite (desktop, pages)	2s
suite (desktop, journeys)	1s
suite (mobile, pages)	2s
suite (mobile, journeys)	2s
plan-explore	-1s
explore (${{ matrix.leg.persona }}, ${{ matrix.leg.target }})	0s
	6s