Sponsors Update

[Niyousha99]

Don't merge until all sponsorship agreements have been signed!

Sponsors section + partner/collab section + "featured guests"?

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 645e730):

https://tech-start-website--pr407-sponsors-37mkldfc.web.app

_{(expires Wed, 01 Feb 2023 04:49:19 GMT)}

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[Niyousha99]

REMOVE PLATFORM