* update api markdown files and add markdown file for ranker
* added docstrings for weaviate
* new version of pydoc-markdown does not render arguments correctly. We used pydoc-markdown==3.11.0
* WIP: First version of preprocessing tutorial
* stride renamed overlap, ipynb and py files created
* rename split_stride in test
* Update preprocessor api documentation
* define order for markdown files
* define order of modules in api docs
* Add colab links
* Incorporate review feedback
Co-authored-by: PiffPaffM <markuspaff.mp@gmail.com>