Add automated `apidoc`

[alecandido]

Apidoc added

Checklist before merge:

• [ ] Reviewers confirm new code works as expected.
• [ ] Tests are passing.
• [ ] Documentation is updated.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (a17a09c) 72.42% compared to head (4ee1fa1) 72.42%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## update-docs #58 +/- ## ============================================ Coverage 72.42% 72.42% ============================================ Files 11 11 Lines 544 544 ============================================ Hits 394 394 Misses 150 150 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `72.42% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qiboteam#carryforward-flags-in-the-pull-request-comment) to find out more.

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[alecandido]

We should tell pydocstyle to only have a look inside src/...

(but I can also provide a minimal docstring for the conf.py function, all in all it's not a bad idea)

[rodolfocarobene]

Thanks @AleCandido

We should tell pydocstyle to only have a look inside src/... (but I can also provide a minimal docstring for the conf.py function, all in all it's not a bad idea)

I think a super-minimal docstring is nice :-)

[alecandido]

As usual, I'd merge this after #52 and #57