docs: add example for contact point overrides

examples/contactpoint_override/README.md

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+---
+title: "Contact point overrides"
+linkTitle: "Contact point overrides"
+---
+
+Contact point overrides allow you to set configuration values using secrets or configmaps instead of directly in the resource
+
+{{< readfile file="resources.yaml" code="true" lang="yaml" >}}

examples/contactpoint_override/resources.yaml

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+apiVersion: v1
+kind: Secret
+metadata:
+  name: contact-mails
+stringData:
+  alert-mails: "[email protected]"
+---
+apiVersion: grafana.integreatly.org/v1beta1
+kind: GrafanaContactPoint
+metadata:
+  name: grafanacontactpoint-sample
+spec:
+  name: grafanacontactpoint-sample
+  type: "email"
+  instanceSelector:
+    matchLabels:
+      instance: my-grafana-stack
+  settings:
+    subject: 'Grafana Alert'
+  valuesFrom:
+    - targetPath: addresses
+      valueFrom:
+        secretKeyRef:
+          name: contact-mails
+          key: alert-mails