[docs] Add tutorials "How to use API (command line)", Jupyter examples

    modified:   ../conf.py
modified:   ../index.rst
modified:   ../requirements.txt
deleted:    guide.rst
new file:   howto-api-cli.rst
new file:   tutorials.rst
    new file:   jupyter/o3api_plot_tco3
    new file:   jupyter/o3api_data+analysis_tco3