code: def post_ext_init(state):
      
      app = state.app
  
      app.config.setdefault(
          'OAUTHCLIENT_SITENAME',
          app.config.get('THEME_SITENAME', 'Invenio'))
      app.config.setdefault(
          'OAUTHCLIENT_BASE_TEMPLATE',
          app.config.get('BASE_TEMPLATE',
                         'invenio_oauthclient/base.html'))
      app.config.setdefault(
          'OAUTHCLIENT_COVER_TEMPLATE',
          app.config.get('COVER_TEMPLATE',
                         'invenio_oauthclient/base_cover.html'))
      app.config.setdefault(
          'OAUTHCLIENT_SETTINGS_TEMPLATE',
          app.config.get('SETTINGS_TEMPLATE',
                         'invenio_oauthclient/settings/base.html'))
docs: Setup blueprint.