Add Custom Pages feature

- Add config/pages directory
- Add new custom pages controller and route
- Add generated links in the footer

src/classes/Controllers/Web/Page.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Friendica\Directory\Controllers\Web;
+
+/**
+ * @author Hypolite Petovan <mrpetovan@gmail.com>
+ */
+class Page extends BaseController
+{
+	/**
+	 * @var string
+	 */
+	private $pageFile;
+
+	public function __construct(
+		string $pageFile
+	)
+	{
+		$this->pageFile = $pageFile;
+	}
+
+	public function render(\Slim\Http\Request $request, \Slim\Http\Response $response, array $args): array
+	{
+		$content = file_get_contents($this->pageFile);
+
+		return ['content' => $content];
+	}
+}