The Kybra Book Initial Publish

[lastmjs]

• Since people only read the absolute bare minimum, put in that bare minimum that they read the import things that they must know
• Copy everything from Azle
• Add documentation for function guards
• We might want to explain in the deployment section how to deal with pip cache purge or other problems with old versions of Kybra being present
• we need to discuss the discrepancy for void on init, pre_upgrade, post_upgrade, heartbeat, etc
• look into pipx for quick start and such
• Double-check all examples, make sure they compile without errors and execute #298
• The Candid chapter should match the Azle Candid chapter more closely #299
• Finish the reference section #300