Fixes links in onboarding route

[benjaminsehl]

Fixes #488 by changing the onboarding route markup to use:

return (
    <>
      <Layout shopName={shopName}>
        {configDone ? <HydrogenLogoBaseColor /> : <HydrogenLogoBaseBW />}
        <h1>Hello, {shopName || 'Hydrogen'}</h1>
        <p>Welcome to your new custom storefront</p>
        <section className="Banner">
          <div>
            <IconBanner />
            <h2>Configure storefront token</h2>
          </div>
          <p>
            You&rsquo;re seeing this because you have not yet configured your
            storefront token. To get started, edit {` `}
            <code>.env</code>. Then, create your first route with the file {` `}
            <code>/app/routes/index.jsx</code>. Learn more about
            {` `}
            <a href="https://shopify.dev/docs/custom-storefronts/hydrogen/environment-variables">
              editing environment variables
            </a>
            and
            <a href="https://shopify.dev/docs/custom-storefronts/hydrogen/building/begin-development#step-4-create-a-route">
              creating routes
            </a>
            .
          </p>
        </section>
        <ResourcesLinks />
      </Layout>
    </>
  );
}

[blittle]

Probably add a changeset: npm run changeset add