14. As a user, I want to see semantic descriptive HTML and design for increased accessibility

[wlcreate]

Acceptance Criteria:

• convert all <div> tags to updated semantic tags (see resources below)
• seek all opportunities for WCAG best practices
• update Header component with the appropriate tags for a navigation bar
• make sure there are appropriate alt and/or aria-label attributes
• check for accessibility

https://levelup.gitconnected.com/getting-in-the-habit-of-writing-semantic-html-c7e507606385
https://www.w3schools.com/html/html5_semantic_elements.asp
https://medium.com/swlh/semantic-html-for-better-accessibility-a54d0742033f