Include links to the mailing lists on the Contact us page

The contact us page should include links to the subscription pages for the nmaas-annouce and nmaas-users mailing lists, along with an appropriate description:

https://lists.geant.org/sympa/info/nmaas-announce (low frequency nmaas news)
https://lists.geant.org/sympa/info/nmaas-users (users discussion about nmaas)

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