docs: Adding config to reference section (#19441)

Author: JStickler

docs/sources/reference/loki-config-ref.md

@@ -0,0 +1,20 @@
+---
+title: Grafana Loki configuration parameters
+menuTitle: Loki configuration reference
+description: Configuration reference for the parameters used to configure Grafana Loki.
+aliases:
+  - ./configuration # /docs/loki/<LOKI_VERSION>/configuration/
+weight: 400
+---
+
+# Grafana Loki configuration parameters
+
+Grafana Loki is configured in a YAML file (usually referred to as `loki.yaml` )
+which contains information on the Loki server and its individual components,
+depending on which mode Loki is launched in.
+
+Configuration examples can be found in the [Configuration Examples](examples/configuration-examples/) document.
+
+<!-- The shared `configuration.md` file is generated from `/docs/templates/configuration.template`. To make changes to the included content, modify the template file and run `make doc` from root directory to regenerate the shared file. -->
+
+{{< docs/shared lookup="configuration.md" source="loki" version="<LOKI_VERSION>" >}}