Aztec Docs Updates

[critesjosh]

Tasks

• Consolidate and Automate tutorial testing #266
• Update contract artifact docs #263
• Update roadmap page at /aztec/aztec/roadmap
• Explain Transactions through data structures #141
• [docs]: Make the CLI reference page autogenerated #327
• [docs] Make global constants more visible #419
• [docs]: document private log limits #439

Completed issues have been removed