Updating Monitoring guide to use newest helm charts and add config required by the version bump

[PandaFood]

Updated the versions in the monitoring guide to the newest available so it would work on an up to date kubernetes cluster. Added a minimal config file for loki which was required for the updated helm chart.

I also changed the label selector for kubernetes app names as they are exported as "app" instead of "app.kubernetes.io/name" nowadays.

[J12934]

Awesome thank you for the PR.
Did you have a look at the (newer?) loki-stack chart?
If i get it correctly the loki chart got so complicated because for simple usecases they recommend the loki-stack chart which is more of a all in one chart combinding a single instance loki with promtail. That sounds like it would be a better fit for the guide?

https://artifacthub.io/packages/helm/grafana/loki-stack

[PandaFood]

I only looked in to it slightly, but it looks like they've turned around on that one again. According to many issues and this post, grafana/helm-charts#3149 (comment) , the loki-stack chart is depricated, but they're generally not being very clear

[J12934]

@PandaFood ah ok :(
Was hoping we could simplify this a bit, thank your for looking into this 👍
Will try this out over the next couple of days and merge it then :)