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/tests/_support/Libraries/ConfigReader.php

@@ -1,55 +0,0 @@
-<?php
-
-
-/**
- * CodeIgniter
- *
- * An open source application development framework for PHP
- *
- * This content is released under the MIT License (MIT)
- *
- * Copyright (c) 2014-2019 British Columbia Institute of Technology
- * Copyright (c) 2019-2020 CodeIgniter Foundation
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * @package    CodeIgniter
- * @author     CodeIgniter Dev Team
- * @copyright  2019-2020 CodeIgniter Foundation
- * @license    https://opensource.org/licenses/MIT	MIT License
- * @link       https://codeigniter.com
- * @since      Version 4.0.0
- * @filesource
- */
-
-namespace Tests\Support\Libraries;
-
-/**
- * Class ConfigReader
- *
- * An extension of BaseConfig that prevents the constructor from
- * loading external values. Used to read actual local values from
- * a config file.
- */
-class ConfigReader extends \Config\App
-{
-	public function __construct()
-	{
-	}
-}