🧹 Clean unused functions

[yamilbknsu]

The following functions are duplicated or unused:

• household_stats and print_household_stats:models/household_reorg.py#138
• update_income: models/main.py#41
• update_households: models/main.py#93
• print_marr_status: models/main.py#131
• generate_outputs: models/main.py#143
• generate_metrics: models/main.py#174
• income_stats (Usage commented out): models/main.py#27