Move to Symfony Flex

The structure changed completely.
Bundles are gone. Everything is flatten in the folder `src`.
I separated import & api controllers to avoid _pollution_ in the main controller folder.

src/Tools/Utils.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace App\Tools;
+
+class Utils
+{
+    /**
+     * Generate a token used for Feeds.
+     *
+     * @param int $length Length of the token
+     *
+     * @return string
+     */
+    public static function generateToken($length = 15)
+    {
+        $token = substr(base64_encode(random_bytes($length)), 0, $length);
+
+        // remove character which can broken the url
+        return str_replace(['+', '/'], '', $token);
+    }
+
+    /**
+     * For a given text, we calculate reading time for an article based on 200 words per minute.
+     *
+     * @param string $text
+     *
+     * @return float
+     */
+    public static function getReadingTime($text)
+    {
+        return floor(\count(preg_split('~([^\p{L}\p{N}\']+|(\p{Han}|\p{Hiragana}|\p{Katakana}|\p{Hangul}){1,2})~u', strip_tags($text))) / 200);
+    }
+}