feat(episodes): add create form and view pages for episode

- add james-heinrich/getid3 library as a dependency to composer.json
- update DEPENDENCIES.md file
- fix episodes table migration script
- add js devDependencies: prettier, @prettier/plugin-php and lint-staged to automatically format staged files before commit
- reformat all files to the prettier format
- refactor code by separating some logic as helper functions
- overwrite existing files when uploading new files with the same name

fixes #1

app/Models/PlatformLinkModel.php

@@ -2,7 +2,7 @@
 /**
  * Class PlatformLinkModel
  * Model for platform links table in database
- * @author     Benjamin Bellamy <ben@podlibre.org>
+ *
  * @copyright  2020 Podlibre
  * @license    https://www.gnu.org/licenses/agpl-3.0.en.html AGPL3
  * @link       https://castopod.org/
@@ -28,4 +28,4 @@ class PlatformLinkModel extends Model
     protected $useSoftDeletes = false;
 
     protected $useTimestamps = true;
-}
+}