The form of government of any municipality proceeding under this article shall be known as the “council-manager form of government.” Pursuant to the provisions and limitations of this article, and subject to the limitations imposed by the Constitution and laws of Alabama, all powers of the municipality shall be vested in the council as herein provided. All powers of the municipality shall be exercised in the manner prescribed by this article, or if the manner is not prescribed herein, then in such manner as may be otherwise prescribed by law or ordinance.