add kubesnapit link

Signed-off-by: Richard Hooper <Richard.Hooper@pixelrobots.co.uk>

Author: Richard Hooper

docs/_config.yml

@@ -41,6 +41,9 @@ nav_external_links:
   - title: KubeDeck
     url: https://kubedeck.io
     opens_in_new_tab: true
+  - title: KubeSnapIt
+    url: https://kubesnapit.io
+    opens_in_new_tab: true
   - title: Pixel Robots
     url: https://pixelrobots.co.uk
     opens_in_new_tab: true