remove checkout step from instructions as v4 is the default branch

Jacky Zhao

2023-08-20 425c9789a451e69adbba2d99193e38e8915e8804

 quartz/plugins/transformers/lastmod.ts

@@ -36,6 +36,7 @@
              } else if (source === "frontmatter" && file.data.frontmatter) {
                created ||= file.data.frontmatter.date
                modified ||= file.data.frontmatter.lastmod
                modified ||= file.data.frontmatter.updated
                modified ||= file.data.frontmatter["last-modified"]
                published ||= file.data.frontmatter.publishDate
              } else if (source === "git") {