chore: gw api is now served with fabric api

Signed-off-by: Sergei Lukianov <me@slukjanov.name>

Author: Frostman

docs/reference/.pages

@@ -1,5 +1,5 @@
 nav:
-  - Fabric API: fabric-api.md
+  - Fabric & Gateway API: fabric-api.md
   - Fabricator API: fab-api.md
   - Gateway API: gateway-api.md
   - ...

docs/reference/fabric-api.md

@@ -1,4 +1,4 @@
-It's an automatically generated reference for the Fabric API.
+It's an automatically generated reference for the Fabric and Gateway API.
 You can find latest version in the [Fabric repository](https://github.com/githedgehog/fabric/blob/master/docs/api.md).
 
 --8<-- "docs/reference/fabric-api.md.gen"

docs/reference/gateway-api.md

@@ -1,4 +1 @@
-It's an automatically generated reference for the Gateway API.
-You can find latest version in the [Gateway repository](https://github.com/githedgehog/gateway/blob/master/docs/api.md).
-
---8<-- "docs/reference/gateway-api.md.gen"
+Gateway API is now included into the [Fabric API](./fabric-api.md).