add ext link to developer docs

Author: simonaglover95

mkdocs.yml

@@ -62,15 +62,13 @@ nav:
       - Bridge6: manuals/bridge6/index.md
       - Bridge4: manuals/bridge4/index.md
       - Aero: manuals/aero/index.md
-    #  - FlexiHub: manuals/flexihub/index.md
       - Polar: manuals/polar/index.md
       - CLiCK v2: manuals/click-v2/index.md
       - Exp-Doubler: manuals/exp-doubler/index.md
       - CLiCK v1: manuals/click-v1/index.md
       - µLOOP v1: manuals/µloop/index.md
       - Thru Gizmo: manuals/thru-gizmo/index.md
-  - Device API:
-      - Getting Started: device-api/index.md
+  - Device API: https://developer.piratemidi.com
   - Support: support/index.md
 
 extra_css: