Use seperate page per collector

collectors/loadavgMetric.md

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+
+## `loadavg` collector
+
+```json
+  "loadavg": {
+    "exclude_metrics": [
+      "proc_run"
+    ]
+  }
+```
+
+The `loadavg` collector reads data from `/proc/loadavg` and outputs a handful **node** metrics. If a metric is not required, it can be excluded from forwarding it to the sink.
+
+Metrics:
+* `load_one`
+* `load_five`
+* `load_fifteen`
+* `proc_run`
+* `proc_total`