Refactor of analytical part of the codebase

What's Changed

• Add example plots to readme by @KonradDanielewski in #1
• Update Example_notebook.ipynb by @KonradDanielewski in #2
• Update Example_notebook.ipynb by @KonradDanielewski in #3
• refactor by @KonradDanielewski in #4

Full Changelog: https://github.com/KonradDanielewski/SEBA/commits/alpha