Add hugo.IsServer as alias of site.IsServer

[earthboundkid]

I was changing some code from hugo.IsProduction and I tried writing hugo.IsServer, which it turns out does not work. This is should be site.IsServer instead. But why? I think the answer is that site.IsServer predates the hugo action. Now that we have hugo, I think site.IsServer should be removed from the docs (although maybe not actually removed for a long time) and hugo.IsServer should be added.

[jmooring]

I agree that's a better place for it, but also want to clarify that hugo.IsProduction and site.IsServer are two very different things:

$ hugo server -e production

{{ site.IsServer }} --> true
{{ site.IsProduction }} --> true

And I think hugo.Environment is the most useful of the three.

[earthboundkid]

Yeah, I was changing the code because it was testing for prod but it really needed to be testing for server vs compiled.

[bep]

Yes, we should do this. I have found that the most useful construct in this department is:

{{ if ne hugo.Environment "development"  }}
{{ end }}

The above works if you have additional "production like" environments (staging ...).

So, maybe we should add a hugo.IsDevelopment too.

[github-actions]

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