Tidy up lab numbering and add cost accounting lab (#459)

* Fixing folder naming

* Fixing folder naming - missed one

* Updated and fixed levels and titles

* Moved the ML part to section 9 again to bring the cost controls in

* Adding initial cost controls section from what was written for ISC

* Adding cost controls images

* Adding cost controls images

* Cost Controls Chapters fixes

* Cost Controls Chapters fixes

* Cost Controls scripts

Author: maxsamazon