3di | TOC update - move 'Distributions' section to own toc node

[sarahfarnborough-3di]

Description

We've moved the set of “Distributions” articles out of Get started and up to its own top-level node between Get started and ROS Framework.

Related to: ros2/ros2_documentation/issues #6825

Did you use Generative AI?

No

Additional Information

Documentation updates from 3di Information Solutions, agreed with Geoff and Tully.

Label

Please add backport-lyrical

[kscottz]

@sarahfarnborough-3di I had some concerns about the backport of this PR clobbering the URL of our official Lyrical release notes. I built it locally and ran into the following warnings:

/home/katscott/Code/ros2_documentation/source/Get-Started/About-ROS/About-ROS.rst:144: WARNING: unknown document: '../Releases/Release-Rolling-Ridley' [ref.doc]
/home/katscott/Code/ros2_documentation/source/Get-Started/Installation.rst:30: WARNING: unknown document: 'Releases/Release-Lyrical-Luth' [ref.doc]
/home/katscott/Code/ros2_documentation/source/Releases/Release-Kilted-Kaiju.rst:361: WARNING: unknown document: '../Installation/Alternatives/Windows-Development-Setup' [ref.doc]
/home/katscott/Code/ros2_documentation/source/Releases/Release-Rolling-Ridley.rst:41: WARNING: 'any' reference target not found: ../Installation [ref.any]

The good news is that I think all of the paths land in the right spot so my concerns were unfounded (see the images below).

If you can address the warnings and the CI issues I'll gladly approve this.