Add missing server context from cloudflare example

[robmen]

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The Cloudflare example using astro;env did not work because it was missing the context. Adding /server fixed it for me, so I thought I'd send the change your way. If there is a better fix, please feel free to close this PR with a better one. 😄

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[sarah11918]

Thanks for this @robmen ! I suspect this is exactly the change needed, but I'll tag @florian-lefebvre in to also confirm whether we should be updating this reference page/example so that we're always importing from either /client or /server everywhere we show it!

[florian-lefebvre]

Perfect thanks!

[florian-lefebvre]

Yes the reference should be updated too, to use astro:env/server

[sarah11918]

Thanks Florian!

@robmen Would you be able to also add the change to the reference page I linked above in my last comment?