readme: fix a typo (accessability -> accessibility)

[Wertzui123]

Contributor checklist

• This pull request is on a separate branch and not the main branch

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Description

Just a plain & simple typo fix.

[netlify]

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[github-actions]

Thank you for the pull request!

The activist team will do our best to address your contribution as soon as we can. The following is a checklist for maintainers to make sure this process goes as well as possible. Feel free to address the points below yourself in further commits if you realize that actions are needed :)

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Maintainer checklist

• The TypeScript and formatting workflows within the PR checks do not indicate new errors in the files changed

• The Playwright end to end and Zap penetration tests have been ran and are passing (if necessary)

• The CHANGELOG has been updated with a description of the changes for the upcoming release and the corresponding issue (if necessary)

[github-actions]

First PR Commit Check

• The commit messages for the remote branch of a new contributor should be checked to make sure their email is set up correctly so that they receive credit for their contribution
  • The contributor's name and icon in remote commits should be the same as what appears in the PR
  • If there's a mismatch, the contributor needs to make sure that the email they use for GitHub matches what they have for git config user.email in their local activist repo

[andrewtavis]

I guess that's why we shorten it to a11y :) Thanks, @Wertzui123!

[Wertzui123]

You're welcome!