[WIP] Provide version dropdown in docs

[Bi0T1N]

Description

This provides a dropdown in the docs on the right side to select the desired docs for a specific version.

Related Issue

Resolves #4537

Motivation and Context

A dropdown in the docs will improve the user experience and ease the understanding which version of the docs are currently viewed (see #4537).
It also allows to switch between multiple versions but this needs more changes since the docs for all versions need to be published. Dropdown selection for versions is used very often in documentation (e.g. https://docs.python.org/3.14/) and the design is inspired by ROS 2

How Has This Been Tested?

By running the commands in a devcontainer that are provided in the docs subfolder. Browsing the docs was tested with Firefox under Linux.

Screenshots (if appropriate):

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[sonarqubecloud[bot]]

Quality Gate failed

Failed conditions
B Reliability Rating on New Code (required ≥ A)

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[Bi0T1N]

The remaining issue is that the docs for different versions need to be created and published. Currently there are only docs for 5.12 and latest. But I couldn't find where this is done. Or is this a manual task? :shrug:

[arturcic]

The remaining issue is that the docs for different versions need to be created and published. Currently there are only docs for 5.12 and latest. But I couldn't find where this is done. Or is this a manual task? 🤷

v5.12 I manually ported back into the main branch, but I think we can automate this at publishing minor/major versions, @gep13 could probably help us with some suggestions