Add new NUC model and prune outdated advice.
Add new NUC model and prune outdated advice.

garrettr/securedrop,conorsch/securedrop,conorsch/securedrop,micahflee/securedrop,ehartsuyker/securedrop,garrettr/securedrop,garrettr/securedrop,heartsucker/securedrop,heartsucker/securedrop,conorsch/securedrop,micahflee/securedrop,ehartsuyker/securedrop,micahflee/securedrop,ehartsuyker/securedrop,ehartsuyker/securedrop,ehartsuyker/securedrop,conorsch/securedrop,micahflee/securedrop,heartsucker/securedrop,conorsch/securedrop,garrettr/securedrop,heartsucker/securedrop,ehartsuyker/securedrop,heartsucker/securedrop