Vectorize icons for external links and change color on hover

[mattt]

(☝️ Does what it says on the tin)

https://github.com/replicate/zoo/assets/7659/86533576-712c-45e8-9b9e-75f460c946a0

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Name	Status	Preview	Comments	Updated (UTC)
zoo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 16, 2023 10:38pm

[mattt]

@cbh123 Please run your formatter over the affected files before merging. For whatever reason, my VSCode auto-formatter is taking extreme measures when I ⌘S and I can't get it to match the project settings.