New Documentation Translation Infrastructure

After many months of work by Petter, Jérémie, Steffen and Hans the LinuxCNC
documentation has been restructured into a format that can be cloud-translated
by Weblate.

This allows anyone to translate the docs from English into another language
that they also speak.

You can help!

https://hosted.weblate.org/projects/linuxcnc/linuxcnc-docs/

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