Resolve "[Eng] Add a CTA on /install/ce-or-ee/ below the two boxes"

Production	Review app
https://about.gitlab.com/install/ce-or-ee	https://1380-eng-add-a-cta-on-install-ce-or-ee-below-the-two-boxes.about.gitlab-review.app/install/ce-or-ee/

• 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 #1380 (closed)