Add GitHub "edit" button (#157)

data/config.yaml

@@ -9,6 +9,8 @@ enableSPA: true
 enableFooter: true
 enableContextualBacklinks: true
 enableRecentNotes: false
+enableGitHubEdit: false
+GHlink: https://github.com/jackyzha0/quartz/tree/hugo/content
 description:
   Host your second brain and digital garden for free. Quartz features extremely fast full-text search,
   Wikilink support, backlinks, local graph, tags, and link previews.