Request accessibliity feedback on 2.x.x cookie notice update

[edthedev]

Context

See https://github.com/app-illinois/Design-Resources/milestone/4

Tasks

• blocked by Add 'Essential / Only Necessary' button to Cookie Notice #1 and Add script attribute to the cookie banner to mark additional cookies as essential. #2
• blocked by Update the demo page with the latest version of the notice #5
• run our demo page through one or more of the tools available at https://itaccessibility.illinois.edu/web-evaluation-tools
• request a fresh accessibility scan of our demo site at https://app-illinois.github.io/Design-Resources/
• reach out to a member of the Accessibility Review Committee to share results so far, and see if further guidance is recommended. https://itaccessibility.illinois.edu/policy/technology-accessibility-review-committee
• add new issues here to track remediation of any significant findings of any of the steps above