Add example file.

example/site/blog/000-first.cfg.php

@@ -0,0 +1,4 @@
+<?php
+$blog_title = "My First Post";
+$blog_date = "2022-11-07";
+?>

example/site/blog/000-first.html.php

@@ -0,0 +1,9 @@
+<?php
+include("site/blog/000-first.cfg.php");
+$title = $blog_title;
+include("templates/header.html.php");
+?>
+<p>My first blog post.</p>
+<?php
+include("templates/footer.html.php");
+?>