feat(ux): remove admin dashboard and redirect directly to podcast list

As there is currently no info on the dashboard, it is unnecessary for now

app/Controllers/Admin/Home.php

@@ -12,6 +12,7 @@ class Home extends BaseController
 {
     public function index()
     {
-        return view('admin/dashboard');
+        session()->keepFlashdata('message');
+        return redirect()->route('podcast-list');
     }
 }

app/Helpers/rss_helper.php

@@ -54,10 +54,7 @@ function get_rss_feed($podcast, $serviceSlug = '')
         'lastBuildDate',
         (new Time('now'))->format(DATE_RFC1123),
     );
-    $channel->addChild(
-        'generator',
-        'Castopod 0.0.0-development - https://castopod.org/',
-    );
+    $channel->addChild('generator', 'Castopod Host - https://castopod.org/');
     $channel->addChild('docs', 'https://cyber.harvard.edu/rss/rss.html');
 
     $channel->addChild('title', $podcast->title);

app/Views/admin/_sidebar.php

 <?php
 $navigation = [
-    'dashboard' => ['icon' => 'dashboard', 'items' => ['admin']],
     'podcasts' => [
         'icon' => 'mic',
         'items' => ['podcast-list', 'podcast-create', 'podcast-import'],