(docs) fix broken catalod api reference link

The make target `crd-ref-docs` generates the api reference doc
operator-controller-api-reference.md using the API types in the
`api/` directory.
The docs structure was expecting two files, while only one file
was being generated.

This PR fixes the doc structure to expect only one file, getting
rid of a broken link as a result.

Author: anik120

docs/project/public-api.md

@@ -3,7 +3,6 @@ The public API of OLM v1 is as follows:
 
 - Kubernetes APIs. For more information on these APIs, see:
     - [operator-controller API reference](../api-reference/operator-controller-api-reference.md)
-    - [catalogd API reference](../api-reference/catalogd-api-reference.md)
 - `Catalogd` web server. For more information on what this includes, see the [catalogd web server documentation](../api-reference/catalogd-webserver.md)
 
 !!! warning

mkdocs.yml

@@ -50,7 +50,6 @@ nav:
     - Version Ranges: concepts/version-ranges.md
   - API Reference:
     - Operator Controller API reference: api-reference/operator-controller-api-reference.md
-    - CatalogD API reference: api-reference/catalogd-api-reference.md
     - CatalogD Web Server reference: api-reference/catalogd-webserver.md
   - Contribute:
     - Contributing: contribute/contributing.md