[examples] Simplify use of ImGui (#525)

* [examples] Simplify use of ImGui

* Fix liver-scriptcontroller

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Co-authored-by: Paul Baksic <paul.baksic@outlook.fr>

[doc] Fix links in FirstSteps (#526)

* [doc] Fix links in FirstSteps

* help readibility

[doc] Fix links in FirstSteps (#526)

* [doc] Fix links in FirstSteps

* help readibility

Fix legacy version passed (#523)

Update version in package.nix

Update version to v25.06

Apply suggestions from code review

Co-authored-by: Hugo <hugo.talbot@sofa-framework.org>

update addMass using elementType

WIP

[doc] Towards automatic documentation generation for SofaPython3 (#482)

* [doc] Towards automatic documentation generation for SofaPython3

* Apply suggestions from code review

Co-authored-by: Alex Bilger <alxbilger@users.noreply.github.com>

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Co-authored-by: Alex Bilger <alxbilger@users.noreply.github.com>

[doc] Update .readthedocs.yml