hotdoc module: run hotdoc as an external command during configure

We need to run it as an external command at build time anyway, and we
detect it by looking it up as an ExternalProgram. It seems odd to then
import it into Meson's python interpreter and run the main function.

Moreover, this errors out when you are running two different pythons,
one for Meson and one for hotdoc. For example, when hotdoc is installed
normally, but you're testing Meson against a nondefault newer version of
python.

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