Fix website accessibility issues

[peterychang]

The Accessibility team has identified 40 high priority and 19 low priority accessibility issues on the autogen website.

The issues spreadsheet can be found here: https://microsoft.sharepoint.com/:x:/t/AIRAccessibilityMetrics/EUKpsd8MzCJNmjkEegC3Y7sBTkiccRpyb21CUVIGXFNM4w?e=Q85tsc&CID=32e3a4f7-b13e-3241-96bd-e728ef558053

Sev-1 and Sev-2 are considered high priority, 3 and 4 are low priority. Issues were categorized based on my own understanding of the issue/opinion.

Ping me once a few of the issues have been completed so I can have the accessibility team verify the changes comply with all requirements

Due date: Mar 24, 2025