fix the docs and add examples in the docs

[JulienCalbert]

• fix the docs (see Fix plot in docs #218)
• move some examples from examples to docs/src/examples (see Deprecated examples folder #221)

[codecov-commenter]

Codecov Report

Merging #228 (63f82bc) into master (e763a5a) will not change coverage.
The diff coverage is n/a.

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[adrienbanse]

Thanks @JulienCalbert, I'll maybe just open an issue to add a little more comments in the examples in the doc

[adrienbanse]

@JulienCalbert Seems to be a conflict between the variable name time and Libc.time in the new example with lazy ellipsoids abstractions

[JulienCalbert]

yes good idea, I wrote the examples quickly