Update Nightfall theme configuration to open links in a new tab and update subproject commit

config-nightfall.toml

@@ -38,6 +38,8 @@ theme = "nightfall"
   hostname = "gohugo.io"
   sitedescription = "Minimal dark theme for Hugo"
 
+  openLinksInNewTab = true
+
   showMetadata = true      # Master switch for all metadata display
   showPublishedDate = true         # Show published date on post page
   published = true