Remove unecessary node download during github actions

[bidoubiwa]

Since the github action actions/setup-node@v1 regularly timeout ( multiple times in the last few months [1][2])

15 min before timeout on this C/I

And since latest version of node is builtin with the OS our github actions uses (search for Node here):

runs-on: ubuntu-18.04

I completely removed actions/setup-node@v1 from our g/a. Which was really useful in the case you need a specific version of node. We do not need an older version of node and we should keep up with node latest release.

Other possibility would be to run a node container with the version we want:

your_job:
  runs-on: ubuntu-latest
  container: node:10.9