DSD-1889: POC for <search> exploration

[7emansell]

Fixes JIRA ticket DSD-1889. See this document for explanation behind these proposed changes.

This PR does the following:

• Most importantly: removes role="search" from form element within Searchbar
• Adds recommendation to use <search> in Searchbar documentation
• Creates new page in Reservoir accessibility guide for ARIA landmarks

How has this been tested?

Accessibility concerns or updates

• Updating use of search role in response to new HTML search element

Accessibility Checklist

• Checked Storybook's "Accessibility" tab for color contrast and other issues.
• The feature works with keyboard inputs including tabbing back and forward and pressing space, enter, arrow, and esc keys.
• For hidden text or when aria-live is used, a screenreader was used to verify the text is read.
• For features that involve UI updates and focusing on DOM refs, focus management was reviewed.
• The feature works when the page is zoomed in to 200% and 400%.

Open Questions

Checklist:

• I have updated the Storybook documentation and changelog accordingly.
• I have added relevant accessibility documentation for this pull request.
• All new and existing tests passed.

Front End Review:

• Review the Vercel preview deployment once it is ready.

[vercel]

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[github-actions]

Your pull request is missing a changelog—was that intentional?

[7emansell]

See https://newyorkpubliclibrary.atlassian.net/browse/DSD-1900 and https://newyorkpubliclibrary.atlassian.net/browse/DSD-1901