[#8527] emails: fix missing images, empty cta button and styling issues #5908
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Describe your changes
replace svg with png images as they are better supported, remove an unused cta block, and fix some styling. Also, a4 has been updated to use a new setting so projects can add their own attachments to emails, even those set in a4.
depends on liqd/adhocracy4#1741
closes #5878
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