fix: improve opportunities page responsiveness

[0xApotheosis]

Update the Opportunities page to be responsive across the following breakpoints:

• lg (992px) and above: show all information
• md: (768px) replace asset description with APR, and condense into the asset box with inline-flex
• sm (480): show only APR and "Get started" button

See designs in https://github.com/shapeshift/foxfarm/issues/88 for the expected output.

[cloudflare-workers-and-pages[bot]]

Deploying with    Cloudflare Pages

Latest commit:	9564a61
Status:	✅  Deploy successful!
Preview URL:	https://539fce79.foxfarm.pages.dev

View logs