fix: set upstream in sync handler, cleanup docs around setting up github

Jacky Zhao

2023-12-15 c35818c336e64e43c54766a670e03cd165b59503

 quartz/styles/base.scss

@@ -100,8 +100,6 @@
  }

  & article {
    position: relative;

    & > h1 {
      font-size: 2rem;
    }