Add external links to release note/drafter (#762)

* Add element diagrams to the annotation types guide

* Add external links to release drafter

* Update .github/release-drafter.yml

Co-authored-by: Jacco van den Berg <39033624+LeeLenaleee@users.noreply.github.com>

Co-authored-by: Jacco van den Berg <39033624+LeeLenaleee@users.noreply.github.com>

Author: stockiNail

.github/release-drafter.yml

@@ -42,6 +42,9 @@ template: |
   # Essential Links
 
   * [npm](https://www.npmjs.com/package/chartjs-plugin-annotation)
+  * [Migration guide](https://www.chartjs.org/chartjs-plugin-annotation/latest/guide/migrationV2.html)
+  * [Docs](https://www.chartjs.org/chartjs-plugin-annotation/)
+  * [Samples](https://www.chartjs.org/chartjs-plugin-annotation/latest/samples/intro.html)
 
   $CHANGES