[v9.2.x] Fix website build errors (#66114)

Fix website build errors

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

docs/sources/developers/plugins/_index.md

@@ -24,8 +24,8 @@ npx @grafana/toolkit plugin:create my-grafana-plugin
 
 If you want a more guided introduction to plugin development, check out our tutorials:
 
-- [Build a panel plugin]({{< ref "build-a-panel-plugin.md" >}})
-- [Build a data source plugin]({{< ref "build-a-data-source-plugin.md" >}})
+- [Build a panel plugin]({{< relref "/tutorials/build-a-panel-plugin" >}})
+- [Build a data source plugin]({{< relref "/tutorials/build-a-data-source-plugin" >}})
 
 ## Go further
 
@@ -35,13 +35,13 @@ Learn more about specific areas of plugin development.
 
 If you're looking to build your first plugin, check out these introductory tutorials:
 
-- [Build a panel plugin]({{< ref "build-a-panel-plugin.md" >}})
-- [Build a data source plugin]({{< ref "build-a-data-source-plugin.md" >}})
-- [Build a data source backend plugin]({{< ref "build-a-data-source-backend-plugin.md" >}})
+- [Build a panel plugin]({{< relref "/tutorials/build-a-panel-plugin" >}})
+- [Build a data source plugin]({{< relref "/tutorials/build-a-data-source-plugin" >}})
+- [Build a data source backend plugin]({{< relref "/tutorials/build-a-data-source-backend-plugin" >}})
 
 Ready to learn more? Check out our other tutorials:
 
-- [Build a panel plugin with D3.js]({{< ref "build-a-panel-plugin-with-d3.md" >}})
+- [Build a panel plugin with D3.js]({{< relref "/tutorials/build-a-panel-plugin-with-d3" >}})
 
 ### Guides