Use only Helm docs plus other misc fixes

The main goal of this change is to make sure that there's only one source of truth for the documentation of the values, instead of having values.yaml and docs/values.md playing in different leagues. For this I'm switching the documentation tooling to use helm-docs.

The patchset also includes the following:

• Fix typos and some wording.
• Make sure that the scrapping interval options for the Kube and Node exporters are actually honored (values themselves kept)
• Remove logs' scrapping interval as I think it's a c&p artifact.
• Finish the job started by c40c0044 by adding an extra missing CI rule for the helm_lint job.

docs/logs.md

@@ -25,7 +25,6 @@ Fluentbit collects logs from the `/var/log/containers/` directory and applies a
 logs:
   fluentbit:
     enabled: true  # Enable/disable Fluentbit for log collection
-    scrapeInterval: "15s"  # Prometheus scrape interval for Fluentbit metrics
     resources:
       requests:
         cpu: "5m"
@@ -141,4 +140,4 @@ Be cautious when enabling Fluentbit for large clusters (100+ nodes). The **Kuber
 
 - Adjust Fluentbit resource requests and limits.
 - Tune the API request rate by modifying the filters.
-- Consider other optimization techniques, such as excluding specific log sources.
\ No newline at end of file
+- Consider other optimization techniques, such as excluding specific log sources.