chore(docs): run a11y report, add menu for toggling reports

[evwilkin]

Closes #3744

This PR:

• Runs the a11y report for current website
• Updates the accessibility report with new summary
• Updates the accessibility scorecard displayed on the site with updated data.

TODO:

• [ ] Confirm a11y scorecard details are still accurate
• [ ] Confirm if a11y config needs updating per https://github.com/patternfly/patternfly-org/issues/3618

[patternfly-build]

Preview: https://patternfly-org-pr-3869-site.surge.sh