Merge in "07-sequences"

Merge branch "07-sequences" into "develop"

Summary of the merged in commits:
 * 8c9af64b: Add review and exercises for notebook 07
 * 3cab7a32: Add note why to use python -m pip ...
 * 8fd14a61: Streamline previous content
 * 97436228: Add initial version of notebook 07
 * 00e37555: Adjust content overview in README.md
 * 04d53956: Streamline previous content