Use a bibtex file to handle references in the documentation

[Naereen]

• The way I handle references is archaic and should be changed :boom: !
• The extension sphinxcontrib.bibtex make it easy to use a bibtex file, and for instance to have a page like this one (thanks @guilgautier).
• I already have a beginning of a large bibtex file...

TODO:

• [ ] Configure my conf.py taking inspiration from this one.
• [ ] Test on one page (eg. UCB.py documentation) and check that the references/index.html page gets correctly generated.
• [ ] If it renders correctly, change ALL references in the documentation.

[guilgautier]

Hi there! To make sure things work have a look at https://github.com/guilgautier/DPPy/issues/8#issuecomment-404197566

[Naereen]

Thanks I will!