Add welcome message

Add welcome message if no published post instead 404 error.

system/htmly.php

@@ -26,7 +26,8 @@ get('/index', function () {
 	
 	if(empty($posts) || $page < 1){
 		// a non-existing page
-		not_found();
+		welcome_page();
+		die;
 	}
 	
 	$tl = config('blog.tagline');

system/includes/functions.php

@@ -1076,4 +1076,16 @@ function generate_opml(){
 // Turn an array of posts into a JSON
 function generate_json($posts){
 	return json_encode($posts);
+}
+
+function welcome_page() {
+	echo <<<EOF
+	<div style="font-size:20px;text-align:center;padding:50px 20px;">
+		<h1>Welcome to your new HTMLy-powered blog.</h1>
+		<p>The next thing you will need to do is creating the first account. Please create <strong><em>YourUsername.ini</em></strong> inside <strong><em>admin/users</em></strong> folder and write down your password there:</p>
+		<pre><code>password = YourPassword</code></pre>
+		<p>Login to your blog admin panel at <strong><em>www.example.com/admin</em></strong> to creating your first post.</p>
+		<p>This welcome message will disappear after your first post published.</p>
+	</div>
+EOF;
 }