Add Grokiet

Could Grokiet be added to the list of available applications? They are the same authors as for Czkawka application, which is already support and they say Grokiet is superior to Czkawka in every possible way (this could be added to the website to encourage using Grokiet and not Czkawka). Both Czkawka and Grokiet are AppImages. Monorepo link: https://github.com/qarmin/czkawka