feat: support better port 0 user facing messages #2859
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If a user chooses to use port 0, then the operating system will choose one of the available ports automatically. This is very useful in cases where you want to allow a `zola serve` for a broader user base which might already bind a subset of their ports and if you don't know which ones they might use. This feature was already supported by zola, however, the printed output just printed port 0 and didn't report which port the operating system actually chose. Example output of `zola serve -p 0` before the change ``` Web server is available at http://127.0.0.1:0 (bound to 127.0.0.1:0) ``` Example output of `zola serve -p 0` after the change ``` Web server is available at http://127.0.0.1:37327 (bound to 127.0.0.1:37327) ```
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Supersedes #2848. See that PR for details.