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

tests/_support/Models/ExampleModel.php

@@ -0,0 +1,26 @@
+<?php namespace Tests\Support\Models;
+
+use CodeIgniter\Model;
+
+class ExampleModel extends Model
+{
+	protected $table      = 'factories';
+	protected $primaryKey = 'id';
+
+	protected $returnType     = 'object';
+	protected $useSoftDeletes = false;
+
+	protected $allowedFields = [
+		'name',
+		'uid',
+		'class',
+		'icon',
+		'summary',
+	];
+
+	protected $useTimestamps = true;
+
+	protected $validationRules    = [];
+	protected $validationMessages = [];
+	protected $skipValidation     = false;
+}