Feat: update architecture documents to reflect current package

General MR

Summary

• Updating Authservice architecture document to reflect proper values.
• Add explicit notes for configuring local redis vs connecting to external redis service
• Add more clarity around requirement to deploy redis when setting replicaCount > 1

Preview

https://repo1.dso.mil/platform-one/big-bang/bigbang/-/blob/4f32bf3cffa7ed01225bbaf662f1fc2ef641a005/docs/understanding-bigbang/package-architecture/authservice.md

Issue

Closes #1209 (closed)