Include the 1.8.2 release page and 2022 tree node into the site navigation.

Author: armiol

_data/navigation/release_notes_nav.yml

@@ -1,3 +1,7 @@
+- page: "2022"
+  children:
+    - page: "v1.8.2"
+      url: /release-notes/2022/v1.8.2
 - page: "2021"
   children:
     - page: "v1.8.0"