Resolve "ENG: Replace large images on the site | Conversion Group pages"

• I, the Assignee, have run Axe Devtools on any updated pages, and fixed the relevant accessibility issues.
• These changes meet a specific OKR or item in our Quarterly Plan.
• These changes work on both Safari and Chrome.
• These changes have been reviewed for Visual Quality Assurance and Functional Quality Assurance on Mobile, Desktop, and Tablet.
• These changes work with our Google Analytics and SEO tools.
• These changes have been documented as expected.
• Images are appropriately sized

Closes #889 (closed)