* Cleanup book
* Distinguish upstream from downstream validators
* Add BroadcastStage to Fullnode/Tpu diagrams
* First attempt to re-describe the runtime
* Reorg book
Push back details of the fullnode implementation
* Merge Leader and Validator diagrams
* New sdk-tools diagram
* Move terminology to just after introduction
* Purge use of LAMPORT as an acronym
* Add notes about persistent storage