Uncomment and update the grafana config for whitby based on the new
config format that nixos accepts. I've validated this locally by
visually inspecting the resulting `ini` file, but not actually run it
yet.
Change-Id: I12d78ae48146e1b01bd2a4152276d4c6b16c1a3d
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7191
Autosubmit: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
Reviewed-by: tazjin <tazjin@tvl.su>