Build frontend code on ansible machine, not on raspi

[k-nut]

Currently the frontend code is build on the raspi or small computer that will later host the frontend assets. As theses machines are usually quite low power compared to the machines that ansible runs on (probably a more or less modern laptop) it might make sense to install the dependencies and to build the bundle on the ansible machine and then to only deploy the created artefacts to the raspi. This is the file that would need to change: https://github.com/ISEMS/isems-ansible/blob/master/roles/frontend/tasks/main.yml