Docs/creates backup grafana topic (#74754)

* starts to step out the backup content

* adds shared shortcode

* shares intro content

* Update docs/sources/administration/back-up-grafana/index.md

Co-authored-by: Isabel <76437239+imatwawana@users.noreply.github.com>

* updates 10 and 9.5 upgrade guides with shared content

* makes prettier

* incorporates feedback

---------

Co-authored-by: Isabel <76437239+imatwawana@users.noreply.github.com>

docs/sources/administration/back-up-grafana/index.md

@@ -0,0 +1,15 @@
+---
+description: Describes how to back up a locally provisioned Grafana instance.
+keywords:
+  - grafana
+  - backup
+labels:
+  products:
+    - enterprise
+    - oss
+title: Back up Grafana
+weight: 80
+menuTitle: Back up Grafana
+---
+
+{{< docs/shared lookup="back-up/back-up-grafana.md" source="grafana" version="<GRAFANA VERSION>" >}}