remove meshvpn related files from base role

.../base/files/mesh-vpn/systemd/update-ffhl-mesh-vpn.service

roles/base/files/mesh-vpn/systemd/update-ffhl-mesh-vpn.timer

roles/base/files/systemd-networkd/10-ffhl-mesh.network

roles/base/tasks/dhcpd.yml

roles/base/tasks/main.yml

roles/base/tasks/mesh-vpn.yml

roles/base/tasks/radvd.yml

roles/base/tasks/software.yml

roles/base/tasks/units.yml

roles/base/templates/dhcpd.conf.j2

roles/base/templates/mesh-vpn/fastd-up

roles/base/templates/mesh-vpn/fastd.conf

roles/base/templates/mesh-vpn/update-meshvpn-keys.sh

roles/base/templates/radvd/radvd.conf.j2