Restore WP.org plugin image as a submodule

See !14 (merged)

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• 02c8f544 - Only init submodules where needed

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• 5ed7b42f - Use HTTPS URL since the repo is public, making a key is burdensome

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approved this merge request

enabled an automatic merge when the pipeline for 5ed7b42f succeeds

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mentioned in commit ea684088