twitter metacard not appearing

@nicob pointed out in IRC that twitter is not showing our card image. i've checked with a few unofficial validators (https://tweetpik.com/twitter-card-validator, https://www.bannerbear.com/tools/twitter-card-preview-tool/) and they have no issues. but on twitter, our card looks like this:

i think the issue is the robots.txt file i added to logo, it disallows crawlers from checking the /static directory (containing our card image), and twitter respects robots.txt