docs: add instructions of how to register lovelace resources via yaml (#2236)

* docs: add instructions of how to register lovelace resources via yaml

* Update docs/frontend/custom-ui/registering-resources.md

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

* Update registering-resources.md

---------

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

Author: tobiasdiez

docs/frontend/custom-ui/registering-resources.md

@@ -19,3 +19,11 @@ This area is only available when the active user's profile has "advanced mode" e
 :::
 
 ![Screenshot of the Advanced Mode selector found on the Profile page](/img/en/frontend/frontend-profile-advanced-mode.png)
+
+Alternatively, you can also register the resource by adding it to the `resources` section of `lovelace` in the configuration:
+
+```yaml
+resources:
+  - url: /local/<name of the resource>.js
+    type: module
+```