feat: 🚀 Add PPTX Converter (#904)
* fix: :pencil2: Consistently nomenclature for `chi_square`
* refactor: :lipstick: Change from global variable to class attribute
* build: :recycle: Pre-Commit update and cleaning
* build: :bookmark: Bump to `v0.21.0`
* feat: :rocket: Add PPTX Converter
* docs: :memo: Update docs
* refactor: :recycle: Remove code smell
* refactor: :recycle: Split function call into subfunctions
* refactor: :recycle: Further simplifications
* refactor: :recycle: further extracting methods
* test: :chart_with_upwards_trend: Increase coverage rate
* ci: :memo: Update automatically generated docs
* refactor: :camera_flash: Change layout and update docs
* style: :pencil2: Fixed typos for `raise-test``
* fix: :building_construction: Apply latest bug fix for `nbclassic-extension`
* docs: :memo: Add `polynomial function` to docs
* chore: :recycle: Definition of labeler
* fix: :bug: Use correct examples
* ci: :wrench: Update labeler
