Make all game logos 512x512 in Sanity/Imgur/wherever

[KenEucker]

For the icons to be right in the manifest files, and for the splash screens to work, we need at least a 512x512 transparent/masked image to work with and can downsize as appropriate. This code is supposed to update the manifest file with these sizes:
https://github.com/KenEucker/biketag-vue/blob/production/src/components/ServiceWorker.vue#L56

Also, we should use pwa-asset-generator to generate icons for biketag.org in the main repo:
npx pwa-asset-generator ./pubilc/images/BikeTag.svg --background "#ababab" --scrape false