Add documentation for NI Traktor MX2 mapping

[klassenserver7b]

see: Mixxx PR

[Copilot]

Pull request overview

This PR adds comprehensive wiki documentation for the Native Instruments Traktor MX2 controller, including detailed mapping instructions and a schematic diagram. The documentation follows the established format used for other Native Instruments controllers in the repository.

Changes:

• Added RST documentation file for the NI Traktor MX2 controller with complete mapping details
• Added SVG schematic diagram showing the controller layout with numbered elements

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated 5 comments.

File	Description
source/hardware/controllers/native_instruments_traktor_mx2.rst	Comprehensive documentation for the Traktor MX2 controller including hardware specifications, Mixxx sound preferences, and detailed mapping tables for all 38 control elements
source/_static/controllers/native_instruments_traktor_mx2.svg	Schematic SVG diagram of the controller with labeled elements (1-38) referenced in the documentation

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[JoergAtGithub]

Welcome at Mixxx!
As a first-time contributor we need you to sign the Mixxx Contributor Agreement and comment here when you have done so. It gives us permission to distribute your contribution under the GPL v2 or later license and the Apple Mac App Store. It is also helpful for us to have contact information for contributors in case we may need it in the future.

[klassenserver7b]

I did

Welcome at Mixxx!
As a first-time contributor we need you to sign the Mixxx Contributor Agreement and comment here when you have done so. It gives us permission to distribute your contribution under the GPL v2 or later license and the Apple Mac App Store. It is also helpful for us to have contact information for contributors in case we may need it in the future.

[klassenserver7b]

Should I worry about the link checks? Because none of the errors is from a file changed by this pr.

[acolombier]

No, as long as they are not referring to files you have changed, we won't take account of it!