refact(docs): clean docs

doc/store_diagrams/workflow.md

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+# Workflow
+
+@startuml
+
+state c <<choice>>
+state haswon <<choice>>
+state MarkPoints #lightblue
+state MarkAdvPoints #lightblue
+note right of MarkPoints : automatic 'Mark' transition\nwhen no school
+note right of MarkAdvPoints : automatic 'Mark' transition\nwhen no school
+
+[*] -> RollDice : BeginGame
+RollDice --> RollWaiting : Roll (current player)
+RollWaiting --> MarkPoints : RollResult (engine)
+MarkPoints --> c : Mark (current player)
+c --> HoldHorGoChoice : [new hole]
+c --> [*] : [has won]
+c --> Move : [not new hole]
+HoldHorGoChoice --> RollDice : Go
+HoldHorGoChoice --> MarkAdvPoints : Move
+Move --> MarkAdvPoints : Move
+MarkAdvPoints --> haswon : Mark (adversary)
+haswon --> RollDice : [has not won]
+haswon --> [*] : [has won]
+@enduml