Added example for count option of select and rpc

[dshukertjr]

Adds example for the new count option for select and rpc.

What is the current behavior?

Currently no documentation about the count option

#558

What is the new behavior?

Document contains example for how to use the count option

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main – ./

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docs – ./web

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nextjs-todo-list – ./examples/nextjs-todo-list

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www – ./www

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[kiwicopple]

🔥 🔥 🔥 🔥

absolute legend - amazing work from implementation -> tests -> docs. Thanks @dshukertjr

[dshukertjr]

@kiwicopple Thank you so much! It's truly an honor to be part of such an amazing project.

[johndpope]

https://supabase.com/docs/reference/javascript/select