docs/src/components/Repository/Readme.jsx

import React from 'react'
import PropTypes from 'prop-types'
import remark from 'remark'
import remarkReact from 'remark-react'
import styles from './Readme.module.scss'

export default function Readme({ object }) {
    const readmeHtml =
        object && remark().use(remarkReact).processSync(object.text).contents

    return (
        object && (
            <aside className={styles.readme}>
                <h3 className={styles.title}>README.md</h3>
                {readmeHtml}
            </aside>
        )
    )
}

Readme.propTypes = {
    object: PropTypes.shape({
        text: PropTypes.string.isRequired
    })
}