123 accessibility

[dstopp]

123 Addresses many of the accessibility issues associated w/website. Including these types of examples:

• color contrast needs to meet ratio
• meaningfurl sequence, ie, headers need to be successive (h1, h2, ... )
• text alternatives
• clearly identified roles in content and elements
• page titled appropriately
• link purpose (aria labels, as an example)
• no duplicate ID
• meaningful table headings (label)

Included are a few very minor errors/typos to clean up headers, table headings, tables, html code.