Fix: Add alt text to index, agency index background image #1569
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fixes #1418
This PR takes a different approach from the previous PR - and avoids a lot of complications in new HTML, changing the debug bar, changing templates, etc.
Instead of changing the CSS structure, this PR simply adds an empty
span
tag withrole="img"
andaria-label
with the alt tag, as suggested here: https://www.davidmacd.com/blog/alternate-text-for-css-background-images.html