docs: add how-to/acessibility

[HenriqueLimas]

Description

Add the accessibility docs from Remix as it is useful for people understand what is the scope of React Router regarding accessibility

[changeset-bot]

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Latest commit: 3150fc1

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[remix-cla-bot]

Hi @HenriqueLimas,

Welcome, and thank you for contributing to React Router!

Before we consider your pull request, we ask that you sign our Contributor License Agreement (CLA). We require this only once.

You may review the CLA and sign it by adding your name to contributors.yml.

Once the CLA is signed, the CLA Signed label will be added to the pull request.

If you have already signed the CLA and received this response in error, or if you have any questions, please contact us at [email protected].

Thanks!

- The Remix team

[remix-cla-bot]

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳