docs: remove api reference build command

docs/site/guides/inventory.md

@@ -121,16 +121,3 @@ It is possible to add services to multiple machines via tags as shown
         };
     }
     ```
-
-### API specification
-
-**The complete schema specification is available [here](../reference/nix-api/inventory.md)**
-
-Or it can build anytime via:
-
-```sh
-nix build git+https://git.clan.lol/clan/clan-core#schemas.inventory
-> result
-> ├── schema.cue
-> └── schema.json
-```