RST

Install an RST parser, for example:

composer require gregwar/rst --dev

Use --dev only if easy-doc itself is installed in the "require-dev" of your composer.json

And add .md parsing in the 'extensions' config:

<?php

use Gregwar\RST\Parser;

$parser = new Parser();

return [
    'index' => '/',
    'websiteDirectory' => __DIR__.'/../dist/website',
    'sourceDirectory' => __DIR__,
    'assetsDirectory' => __DIR__.'/assets',
    'layout' => __DIR__.'/layout.php',
    'extensions' => [
        'rst' => function ($file) use ($parser) {
            return $parser->parseFile($file);
        },
    ],
];