📜 Docs: add job posting for backend engineer position to README (#455)

Author: tyler-dane

README.md

@@ -69,3 +69,6 @@ To skip the waitlist, enter `marco@polo.co` when prompted for an email at the lo
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+
+🤝 [Backend Engineer Job Description](https://alpaca-ty.notion.site/Senior-Backend-Engineer-Part-time-Open-source-1f9237bde8f480658f93ea33e6e55481?pvs=4)
+(We're hiring!)