Hugo update baseUrl per environment

[snayp]

/config dir support added, please take it for a spin

If you “compile from source”, have a go at it and tell me what you think … This commit adds support for a configuration directory (default config). The different pieces in this puzzle are: A new --environment (or -e) flag. This can also be set with the HUGO_ENVIRONMENT OS environment variable. The value for environment defaults to production when running hugo and development when running hugo server. You can set it to any value you want (e.g. hugo server -e "Sensible Environment"), but as …

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