Revert automation for bundle schema documentation generation (#1018)

## Changes

Introduced in #1007 but doesn't work well yet. This will be automated
again as part of #1012.

.codegen.json

@@ -8,9 +8,6 @@
         ".codegen/cmds-account.go.tmpl": "cmd/account/cmd.go"
     },
     "toolchain": {
-        "required": ["go"],
-        "post_generate": [
-            "go run main.go bundle schema --only-docs --output-file ./bundle/schema/docs/bundle_descriptions.json"
-        ]
+        "required": ["go"]
     }
 }