Docs - add user docs

data/docs.yaml

@@ -13,6 +13,11 @@ content:
     picture: /images/brand/dash_logo_2018_rgb_for_screens.png
     description: >
       Guides and documentation to help you start working with Dash Platform as quickly as possible, as well as support if you get stuck.
+  - title: Dash User Docs
+    website: https://docs.dash.org/en/stable/
+    picture: /images/sites/readthedocs.png
+    description: >
+      User documentation for understanding general Dash concepts & usage
   - title: Core Developer Guide
     website: https://dash-docs.github.io/en/developer-guide
     source: https://github.com/dash-docs/dash-docs