Add new 'atroot' meta directive

commands/build.go

···
 			if !isDraft || (isDraft && drafts) {
 				posts = append(posts, post)
 			}
+
+			// Copy the post to the root if it's marked as such.
+			// ex: build/blog/foo-bar -> build/foo-bar
+			if post.Meta["atroot"] == "true" {
+				os.Mkdir(filepath.Join(types.BuildDir, slug), 0755)
+				dstFile := filepath.Join(types.BuildDir, slug, "index.html")
+				util.CopyFile(filepath.Join(dstDir, slug, "index.html"), dstFile)
+			}
 		}
 
 		sort.Slice(posts, func(i, j int) bool {

commands/new.go

···
 	url := strings.TrimSuffix(file, filepath.Ext(file))
 
 	content := fmt.Sprintf(`---
+atroot: true
 template:
 slug: %s
 title:

readme

···
     go run contrib/style.go > syntax.css
 
 
+SPECIAL META DIRECTIVES
+
+• draft: sets a post to draft (boolean) and will only be rendered if
+  the build command is run with the --drafts flag.
+• atroot: sets a post to be also rendered at the root of the site.
+
+
 TEMPLATING
 
 Non-index templates have access to the below objects: