Hide kudos button if you've already left kudos.
This script automatically hides the kudos button on works where you've already left kudos. Unlike the original version, it tracks your kudos history using browser storage instead of checking for your username in the kudos list. To transfer your kudos history to other browsers, use AO3: Import & Export Script Storage.
Inspired by the original ao3 no rekudos by scriptfairy.
