All legislative powers of the City shall be vested, subject to the terms of this Charter and of the Constitution of the State, in the Council. The Council shall have authority to pass all ordinances necessary and proper to carry into full force and effect any power, capacity, authority, or jurisdiction which is or shall be granted to or fixed in the City or in the Council or in any officer of the City, and to provide for the enforcement of any or all of their ordinances by reasonable fines and penalties, or by imprisoning offenders against such ordinances, or by any or all of those modes; provided, however, that no person shall be imprisoned more than 30 days or fined more than five hundred dollars for any one offense.