Merging the u-motu and u-motu-mentors lists

[Daniel Holbach]

Hello everybody,

we discussed the move a few cycles ago and it took a while to resolve as
it was unclear how to resolve it best. What we do now is:

 - move all subscribers over to u-motu (if they're not there already)
 - mark the list as obsolete
 - remove it from our documentation

I'd appreciate help with the last item. If you see ubuntu-motu-mentors
still mentioned somewhere, please replace it with ubuntu-motu.

Have a great day,
 Daniel

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