Add section on string interpolation in Intro to Python (#343)

* Add section on string interpolation

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* Update 00_python_intro.ipynb

Co-authored-by: Edoardo Baldi <edoardo.baldi@empa.ch>

* Update 00_python_intro.ipynb

Co-authored-by: Edoardo Baldi <edoardo.baldi@empa.ch>

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Edoardo Baldi <edoardo.baldi@empa.ch>

Author: 3 people