Add .Site.IsServer to determine if the site was built in server mode

[mydoghasworms]

As per the following Discourse discussion:

https://discourse.gohugo.io/t/disable-portions-of-content-while-developing/10860

It would be helpful to put a condition into a template that can determine whether the page is being built/server by hugo server (and not necessarily with the -D flag, for which there is already a variable).

This would be helpful for the case where you want to test the site in its final form (no drafts) but want to switch off, e.g. analytics or ads.

[kaushalmodi]

But isn't this already possible by simply checking if .Site.BaseURL is "localhost"? I do that all the time.

[bep]

But isn't this already possible by simply checking if .Site.BaseURL is "localhost"? I do that all the time.

Not if you run your server with something other than "localhost". I do that all the time. You could, of course, adjust that logic to also check for that hostname, but that would hardly be very portable.

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