Add note about survey and public deployment

README.md

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+> 📢 If you are interested in joining the *datalab* mailing list and helping decide its future, please fill out the survey at https://forms.gle/etq4pcsQJ3omLBmj6.
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+> ℹ️ We have created a public deployment of *datalab* for potential users to test. Please register via the magic-link email sign in at https://public.datalab.odbx.science. Any data stored here will be private but we provide no assurances for availability or data backups, so please do not use this for production work.
 
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