A way to serve a single, specific file as opposed to the hairy monster
that is mg_serve_http.

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Use templated index page and SSI calls instead of hard-coded html

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In CCS example projects

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We haven't actually _fixed_ evaluation of precompiled bcode from
non-mmapped memory: we just never free it. For sane use case (do not
evaluate the same file more than once) it should be acceptable.

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