docs: fix broken links

docs/features/software-catalog/installation.md

@@ -49,7 +49,7 @@ Where `backendUrl` is the `backend.baseUrl` from config, i.e.
 `const backendUrl = config.getString('backend.baseUrl')`.
 
 The catalog components depend on a number of other
-[Utility APIs](/docs/api/utility-apis.md) to function, including at least the
+[Utility APIs](../../api/utility-apis.md) to function, including at least the
 `ErrorApi` and `StorageApi`. You can find an example of how to install these in
 your app
 [here](https://github.com/spotify/backstage/blob/61c3a7e5b750dc7c059ef16b188594d31b2c04c2/packages/app/src/apis.ts#L80).

docs/features/software-templates/installation.md

@@ -143,8 +143,8 @@ const service = createServiceBuilder(module)
 At this point the scaffolder backend is installed in your backend package, but
 you will not have any templates available to use. These need to be added to the
 software catalog, as they are represented as entities of kind
-[Template](/docs/features/software-catalog/descriptor-format.md#kind-template).
-You can find out more about adding templates [here](./adding-templates.md).
+[Template](../software-catalog/descriptor-format.md#kind-template). You can find
+out more about adding templates [here](./adding-templates.md).
 
 To get up and running and try out some templates quickly, you can add some of
 our example templates through static configuration. Add the following to the