hakyll-init: add page (#5454)

pages/common/hakyll-init.md

@@ -0,0 +1,12 @@
+# hakyll-init
+
+> Generate a new Hakyll sample blog.
+> More information: <https://github.com/jaspervdj/hakyll-init>.
+
+- Generate a new Hakyll sample blog:
+
+`hakyll-init {{path/to/directory}}`
+
+- Show help for `hakyll-init`:
+
+`hakyll-init --help`