Refactor the 404 page

Signed-off-by: Fanit Kolchina <[email protected]>

Author: kolchfa-aws

404.md

@@ -8,5 +8,10 @@ nav_exclude: true
 
 ## Oops, this isn't the page you're looking for. 
 
-Maybe our [home page](https://docs.opensearch.org/latest/) or one of the commonly visited pages below will help. If you need further support, please use the feedback feature on the right side of the screen to get in touch.
+Try searching in the search bar or go to the [home page](https://docs.opensearch.org/latest/).
 
+If you need more help:
+
+* Leave us feedback on the right-hand side of the screen
+* Connect with us on [Slack](https://opensearch.org/slack.html)
+* Open an [issue](https://github.com/opensearch-project/documentation-website/issues/new/choose)