So i started playing and im about 79 hours in and ive been actively upgrading sanctuary, its currently got 30 food 1500 water 1500 energy 2500 defence and 95 happines with 20 settlers, but my city level percentage is still at 0% and its been at 0% since i started the game. is it a bug or am i doing something wrong? i currently don't have a leader as i am the leader of the settlement or do i need to have a companion as a leader?