Draft: Resolve "add cheatsheet page"

Closes #18

src/components/cheatsheetForm.js

-import React from 'react';
-import { useState } from 'react'
-
-export default function Form() {
-  const [newsletter, setNewsletter] = useState('male')
-  return (
-    <>
-      <Form.Radio label="Male" checked={newsletter === 'male'} value="Male" onClick={() => setNewsletter('male')} />
-      <Form.Radio label="Female" checked={newsletter === 'female'} value="Female" onClick={() => setNewsletter('female')} />
-    <form method="post" action="https://systeme.io/embedded/3299399/subscription">
-      <input type="text" name="first_name" placeholder="Prénom" required="required" />
-      
-      <input type="email" name="email" placeholder="Email" required="required" />
-      
-      <button type="submit" class="button button--beta button--lg">Oui je veux recevoir des ressources sur GitLab en français !</button>
-    </form>
-    </>
-    );
-}