[Accessibility] Switching from banner to presentation

[MichaelCherry]

Description

Changing image role from banner to presentation.
Based on a few resources:

• role=presentation is supported in all major browsers, JAWS, NVDA, and IE 11
• role=none is supported by JAWS and most major browsers (but not NVDA or IE 11)
• Narrator in Windows supports none of the above.

Resources:
https://codepen.io/stevef/post/none-or-presentation
w3c/aria-practices#515

Type of change

• Bug fix (non-breaking change which fixes an issue)

Screenshot

Testing

Look at the image role in the dev tools

Checklist

Applicable for all code changes.

- [ ] I have commented my code, particularly in hard-to-understand areas

• My changes generate no new compiler warnings
• My changes generate no new accessibility errors and/or warnings
  - [ ] I have added tests that prove my fix is effective or that my feature works
• I have researched WCAG2.1 accessibility standards and met them in this PR (can be navigated using a keyboard)
• My changes look good on IE 11+ and Chrome