[docs] [issue13124] Add "Running a Build Slave" page to the devguide

[Ezio Melotti]

Ezio Melotti added the comment:

> Before I take any time to update the patch, does anyone object
> to the location or intent of the changes?

Adding a new page to the devguide seems OK to me.  It makes the devguide bigger, but it can easily be ignored by developers/contributors if they are not interested.

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