Resolve "ENG: Update All-Remote landing page"

Closes #22 (closed)

Production	Review app
https://about.gitlab.com/company/culture/all-remote/	https://22-eng-update-all-remote-landing-page.about.gitlab-review.app/company/culture/all-remote/

what was done in this MR:

• updated /company/culture/all-remote/ page
• created card wrapper to reuse in card components (adds the card border and shadow)
• updated copy resources component to make the horizontal rule at the bottom optional
• updated cta component to enable custom text on buttons