playing with the layout of the folders
reworked the structure of the docs to broaden the TOC
Merge branch 'rework' into feature/62-structured-outline

Conflicts:
	SUMMARY.md
re#62 reworked the structure of the docs to broaden the TOC. added 3 backtick code styling
re#62 updated Concepts to Essentials, Removed "Data Layer" until started
re#62 quick update of some language
hotfix typo