A generic work item for various documentation enhancements we need to do

• Add more GSDK related links. Describe GSDK lifecycle, Initializing->StandingBy->Active->Process Exit
• Include thundernetes on official PlayFab docs
• Add LocalMultiplayerAgent as a debugging tool
• Mention that user should never modify the .spec of a GameServerBuild/GameServer as soon as its deployed. Builds are immutable (like on MPS).
• Document how to publish a new version of your GameServer (canary releases etc.). Mention that Builds should be immutable
• Describe the GameServer states and the GameServerBuild states as well as respective kubectl output