Copy of UCBVI from rlberry_research to rlberry_scool and misc changes to doc

[JulienT01]

add quick starts in user guide add UCBVI in scool Update quick start accordingly. Objective user guide rlberry-research-free.

Checklist

• [x] My code follows the style guideline To check : black --check examples rlberry *py flake8 --select F401,F405,D410,D411,D412 --exclude=rlberry/check_packages.py --per-file-ignores="init.py:F401",
• [ ] I have commented my code, particularly in hard-to-understand areas,
• [x] I have made corresponding changes to the documentation,
• [ ] I have added tests that prove my fix is effective or that my feature works,
• [x] New and existing unit tests pass locally with my changes,
• [x] If updated the changelog if necessary,
• [x] I have set the label "ready for review" and the checks are all green.

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[TimotheeMathieu]

Just a styling comment: maybe you could use toctrees instead of markdown links for user guide. Example:

```{toctree}
examples/content_child1.md
examples/content_child2.md

[github-actions[bot]]

Hello, The build of the doc succeeded. The documentation preview is available here: https://rlberry-py.github.io/rlberry/preview_pr

[github-actions[bot]]

Hello, The build of the doc succeeded. The documentation preview is available here: https://rlberry-py.github.io/rlberry/preview_pr

[github-actions[bot]]

Hello, The build of the doc succeeded. The documentation preview is available here: https://rlberry-py.github.io/rlberry/preview_pr

[github-actions[bot]]

Hello, The build of the doc succeeded. The documentation preview is available here: https://rlberry-py.github.io/rlberry/preview_pr

[github-actions[bot]]

Hello, The build of the doc succeeded. The documentation preview is available here: https://rlberry-py.github.io/rlberry/preview_pr

[github-actions[bot]]

Hello, The build of the doc succeeded. The documentation preview is available here: https://rlberry-py.github.io/rlberry/preview_pr

[github-actions[bot]]

Hello, The build of the doc succeeded. The documentation preview is available here: https://rlberry-py.github.io/rlberry/preview_pr

[github-actions[bot]]

Hello, The build of the doc succeeded. The documentation preview is available here: https://rlberry-py.github.io/rlberry/preview_pr

[github-actions[bot]]

Hello, The build of the doc succeeded. The documentation preview is available here: https://rlberry-py.github.io/rlberry/preview_pr

[github-actions[bot]]

Hello, The build of the doc succeeded. The documentation preview is available here: https://rlberry-py.github.io/rlberry/preview_pr

[github-actions[bot]]

Hello, The build of the doc succeeded. The documentation preview is available here: https://rlberry-py.github.io/rlberry/preview_pr

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Hello, The build of the doc succeeded. The documentation preview is available here: https://rlberry-py.github.io/rlberry/preview_pr

[TimotheeMathieu]

LGTM for most of it. I did not review the quick start @AdrienneTuynman can you review this? The idea is to make comments either here or using the "Files changed" tab of the PR, based on what you see in the preview of the documentation that can be found here: https://rlberry-py.github.io/rlberry/preview_pr (and in particular, the user guide).

[github-actions[bot]]

Hello, The build of the doc succeeded. The documentation preview is available here: https://rlberry-py.github.io/rlberry/preview_pr