migration to jupyterbook 0.9.1 moving away from jupyterbook legacy, m…

…ajor content harmonization to align with ATI TWB style, revision of all current content, working table of content, ready-ing for major release pending another round of review, closes #161, #159, #158,#143,#131, #119, #118, #117, #116, #70, #44, #32, #24, #20, #19, #10