Update mkdocs.yml

added `endpoints`

Author: MWest2020

mkdocs.yml

@@ -9,6 +9,7 @@ nav:
     - How does it work: "how_does_it_work.md"
     - Features:  "./features/index.md"
     - Api: "api.md"
+    - Endpoints: "endpoints.md"
     - Plugins: "plugins.md"
     - Schemas: "schemas.md"
     - Mappings: "mappings.md"