New documentation

[brash6]

As the title says, this PR is dedicated to documentation updates.

• A new architecture is implemented
• Files in utils folder are removed from doc
• Dependancies are added to setup.py (pytest, sphinx and sphinx_rtd_theme)

TODO:

• Getting started / Examples pages have to be written
• We may want to confirm which Python files have to be shown in the doc

[bthirion]

Thx @brash6 !
The CI is broken atm.
Is there a way to get the generated doc somewhere or do we have to build locally ?

[brash6]

@bthirion As just discussed with @judithabk6 and @houssamzenati, The problem with the CI is related to a problem solved in #81. This PR will be merged as soon as some tests on inputs are implemented.
On another hand, the documentation should still build correctly in the CI when opening a PR on the main branch

[bthirion]

Suggested change

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