Docs: Replace links with relrefs (#32916)

* Update configuration.md

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* Update cloudwatch.md

* Update add-authentication-for-data-source-plugins.md

* Update add-support-for-explore-queries.md

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docs/sources/developers/plugins/backend/_index.md

@@ -49,7 +49,7 @@ The resources capability allows a backend plugin to handle custom HTTP requests
 
 Examples of use cases for implementing resources:
 
-- Implement a custom data source proxy in case certain authentication/authorization or other requirements are required/needed that are not supported in Grafana's [built-in data proxy](https://grafana.com/docs/grafana/next/http_api/data_source/#data-source-proxy-calls).
+- Implement a custom data source proxy in case certain authentication/authorization or other requirements are required/needed that are not supported in Grafana's [built-in data proxy]({{< relref "../../../http_api/data_source.md#data-source-proxy-calls" >}}).
 - Return data or information in a format suitable to use within a data source query editor to provide auto-complete functionality.
 - Return static resources, such as images or files.
 - Send a command to a device, such as a micro controller or IOT device.