docs: def call_builder_init(cls, kb_app, sphinx_app: Sphinx):
          """ On builder init event, commit registry and do callbacks """
  
          # Find and commit docs project plugins
          conf_dir = sphinx_app.confdir
          plugins_dir = sphinx_app.config.kaybee_settings.plugins_dir
          full_plugins_dir = os.path.join(conf_dir, plugins_dir)
  
          if os.path.exists(full_plugins_dir):
              sys.path.insert(0, conf_dir)
              plugin_package = importlib.import_module(plugins_dir)
              importscan.scan(plugin_package)
          else:
              logger.info(f'## Kaybee: No plugin dir at {plugins_dir}')
  
          dectate.commit(kb_app)
          for callback in cls.get_callbacks(kb_app, SphinxEvent.BI):
              callback(kb_app, sphinx_app)