fix indexing causing main thread freeze, various polish

Jacky Zhao

2023-07-04 ab9da02c60c962128820e6874e6f07c98bc3dda7

 quartz/plugins/transformers/toc.ts

@@ -52,9 +52,6 @@
        }
      }]
    },
    htmlPlugins() {
      return []
    }
  }
}