[GH ACTION] Synchronize the docs creation with readthedocs.com

[b-biswas]

To add documentation

• Basic use
• Tutorials [WIP]
• clean notebooks
• Add toy data for running the notebooks
• Synchronize with readthedocs

[b-biswas]

@aboucaud any suggestions on what else to add?
Here is the example version https://madness-deblender.readthedocs.io/en/latest/

[aboucaud]

Looks like a good start !

Don't forget to add a bit of text to the tutorials to guide the reader.
And maybe try to choose a better colorpalette to make the plots prettier. It will help to not confuse the reader with examples such as

which are barely readable. Maybe stretching the images could help (see https://docs.astropy.org/en/stable/visualization/normalization.html).