removes unused logos from newsletter signup

[wesbos]

This is mostly just to test the codecov integration https://github.com/syntaxfm/website/pull/1709

[vercel[bot]]

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Name	Status	Preview	Updated (UTC)
syntax-website	✅ Ready (Inspect)	Visit Preview	Jun 18, 2024 8:31pm

[codecov[bot]]

Bundle Report

Changes will decrease total bundle size by 240 bytes :arrow_down:

Bundle name	Size	Change
website-client-esm	2.46MB	81 bytes :arrow_down:
website-server-esm	30.34MB	159 bytes :arrow_down: