Embed doc images rather than host at imgur #8118

Job	Run time
git_checks	6s
format	0s
ubuntu	0s
windows	0s
CodeQL	0s
docker	0s
el8	0s
macos (${{ matrix.image }}, ${{ matrix.compiler }}, ${{ matrix.arch }}, ${{ matrix.shared }}, ${{ matrix.parallel }})	0s
contract	0s
build_and_test	0s
	6s

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