Linking the accessible URL to the Flowfuse User Addon in the certified nodes list.

**Description:**
Currently, clicking on Flowfuse User Add-on in the certified nodes list redirects to a private repository, displaying users page doesn't exist.

**Expected Behavior:**
An accessible document or page should be linked to the Flowfuse User Addon in the certified nodes list.

Search the website for the certified nodes list and locate the FlowFuse User Add-on entry. Inspect its current link, replace the private repository destination with the accessible document or page described in the issue, and verify that clicking the entry reaches the intended public destination.

Written by the indexing model from the issue text.