feat: add npm for js dependencies + move src/ files to root folder

- add node service in docker-compose.yml
- update .devcontainer Dockerfile by adding node, npm and vim
- init package.json for npm with tailwindcss, postcss, commitlint and commitizen as dev dependencies
- update default layout main header and footer
- replace CI's welcome_message.php with home.php listing all podcasts
- add AUTHORS.md file
- add docs folder in which to place castopod's technical documentation

src/app/Controllers/BaseController.php

@@ -1,46 +0,0 @@
-<?php
-namespace App\Controllers;
-
-/**
- * Class BaseController
- *
- * BaseController provides a convenient place for loading components
- * and performing functions that are needed by all your controllers.
- * Extend this class in any new controllers:
- *     class Home extends BaseController
- *
- * For security be sure to declare any new methods as protected or private.
- *
- * @package CodeIgniter
- */
-
-use CodeIgniter\Controller;
-
-class BaseController extends Controller
-{
-
-	/**
-	 * An array of helpers to be loaded automatically upon
-	 * class instantiation. These helpers will be available
-	 * to all other controllers that extend BaseController.
-	 *
-	 * @var array
-	 */
-	protected $helpers = [];
-
-	/**
-	 * Constructor.
-	 */
-	public function initController(\CodeIgniter\HTTP\RequestInterface $request, \CodeIgniter\HTTP\ResponseInterface $response, \Psr\Log\LoggerInterface $logger)
-	{
-		// Do Not Edit This Line
-		parent::initController($request, $response, $logger);
-
-		//--------------------------------------------------------------------
-		// Preload any models, libraries, etc, here.
-		//--------------------------------------------------------------------
-		// E.g.:
-		// $this->session = \Config\Services::session();
-	}
-
-}