Changes to Python/Overview

• 2022-11-14 17:10:00 UTC (Hans Georg Schaathun): Added triangulation demo
• 2022-11-14 13:56:16 UTC (Hans Georg Schaathun): Notes on dataset
• 2022-11-14 13:43:45 UTC (Hans Georg Schaathun): Added CNN python demo
• 2022-11-14 12:58:17 UTC (Hans Georg Schaathun): Overview of python demoes