Restructuring Containers part of slides of Chaper 2

[IshaanDesai]

Description

This PR does a broad restructuring of the content of the Containers part of the Chapter 2. The exercise is also reworked in this pull request.

Checklist

• [x] I made sure that the markdown files are formatted properly.
• [x] I made sure that all hyperlinks are working.

• [x] I removed deleted content from the timetable.md in the root of this repository.