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/Config/Encryption.php

@@ -1,36 +0,0 @@
-<?php
-namespace Config;
-
-use CodeIgniter\Config\BaseConfig;
-
-/**
- * Encryption configuration.
- *
- * These are the settings used for encryption, if you don't pass a parameter
- * array to the encrypter for creation/initialization.
- */
-class Encryption extends BaseConfig
-{
-	/*
-	  |--------------------------------------------------------------------------
-	  | Encryption Key Starter
-	  |--------------------------------------------------------------------------
-	  |
-	  | If you use the Encryption class you must set an encryption key (seed).
-	  | You need to ensure it is long enough for the cipher and mode you plan to use.
-	  | See the user guide for more info.
-	 */
-
-	public $key = '';
-
-	/*
-	  |--------------------------------------------------------------------------
-	  | Encryption driver to use
-	  |--------------------------------------------------------------------------
-	  |
-	  | One of the supported drivers, eg 'OpenSSL' or 'Sodium'.
-	  | The default driver, if you don't specify one, is 'OpenSSL'.
-	 */
-	public $driver = 'OpenSSL';
-
-}