refactor: add phpstan and update code to adhere to level 5

- move and refactor Image.php from Libraries to Entities folder
- update some database field names
/ types
- update composer packages

app/Controllers/HomeController.php

@@ -0,0 +1,35 @@
+<?php
+
+/**
+ * @copyright  2020 Podlibre
+ * @license    https://www.gnu.org/licenses/agpl-3.0.en.html AGPL3
+ * @link       https://castopod.org/
+ */
+
+namespace App\Controllers;
+
+use App\Models\PodcastModel;
+
+class HomeController extends BaseController
+{
+    /**
+     * @return mixed
+     */
+    public function index()
+    {
+        $model = new PodcastModel();
+
+        $allPodcasts = $model->findAll();
+
+        // check if there's only one podcast to redirect user to it
+        if (count($allPodcasts) == 1) {
+            return redirect()->route('podcast-activity', [
+                $allPodcasts[0]->name,
+            ]);
+        }
+
+        // default behavior: list all podcasts on home page
+        $data = ['podcasts' => $allPodcasts];
+        return view('home', $data);
+    }
+}