Found via `codespell -q 3 -S ./yarn.lock,./CHANGELOG.md,./AUTHORS.md,./config/locales,./app/javascript/mastodon/locales -L ba,followings,keypair,medias,pattens,pixelx,rememberable,ro,te`
Fixes #13757
* Add WebfingerResource class to extract usernames * Use WebfingerResource in xrd#webfinger