Add link to migration tool for Trello
Add link to migration tool for Trello

Signed-off-by: Maximilian Ammann <0706025b2bbcec1ed8d64822f4eccd96314938d0@maxammann.org>

nextcloud/deck,juliushaertl/deck,nextcloud/deck,juliushaertl/deck,nextcloud/deck,juliushaertl/deck