Clojurians Log v2

@holyjak really appreciate your help for us to understand Fulcro! I wish to have some more narrative to explain the diagram in your tutorial. To the minimum, explanation of the legends, such as, the meaning of those icons of solid circle, square, and triangle, etc. (they look intriguing.) Another aspect, please explain the cause-effect relationships of those links in the graph, what happen first, what are the consequence of that action, etc. (I did check your tutorial, it's a pity that without more narrative, your wonder diagram might not reach its fuller impact.)