Fix GitHub stars button when API errors

[nathanchapman]

Before (current website):

After:

Note: rerunning the build + deploy might fix this as well since the data is fetched inside getStaticProps, but this would prevent future issues (e.g. GitHub being down during build) from rendering a weird button

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
spacex-fuse	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 4, 2024 7:50pm

[vercel[bot]]

@nathanchapman is attempting to deploy a commit to the Stellate Team on Vercel.

A member of the Team first needs to authorize it.

[JoviDeCroock]

Thank you so much!