Standardize STA schema and update docs

[GraysonBellamy]

🚀 Feature Request

STA schema for ngb files needs to be standardized or harmonized with existing schema for STA data from .csv files. Docs need to be updated to expand on the extraction process and the differences between the two methods.

🔈 Motivation

Document and clarify the roles and differences between the csv and ngb conversion for STA files