feat: add Fabricator API reference

Signed-off-by: Pau Capdevila <pau@githedgehog.com>

Author: pau-hedgehog

docs/install-upgrade/config.md

@@ -31,6 +31,8 @@ After the above workflow a user will have a .img file suitable for installing th
 
 ## Complete Example File
 
+The following example outlines a comprehensive Fabricator configuration. You can find further configuration details in the Fabricator [API Reference](../../reference/include-fab-api/).
+
 ``` { .yaml .annotate title="fab.yaml" linenums="1"} 
 apiVersion: fabricator.githedgehog.com/v1beta1
 kind: Fabricator

docs/reference/.pages

@@ -1,3 +1,4 @@
 nav:
   - Fabric API: api.md
+  - Fabricator API: include-fab-api.md
   - ...