fix(docs): Add missing index files to git repo

docs/content/docs/graphql-api/admin/_index.md

@@ -0,0 +1,10 @@
+---
+title: "Admin API"
+weight: 4
+showtoc: false
+---
+
+# GraphQL Admin API
+
+The Admin API is primarily used by the included Admin UI web app to perform administrative tasks such as inventory management, order tracking etc.
+

docs/content/docs/graphql-api/shop/_index.md

@@ -0,0 +1,9 @@
+---
+title: "Shop API"
+weight: 3
+showtoc: false
+---
+
+# GraphQL Shop API
+
+The Shop API is used by storefront applications. It provides all the necessary queries and mutations for finding and viewing products, creating and updating orders, checking out, managing a customer account etc.