cleanup of the heroku configuration

this removes the general `postinstall` call to `bin/heroku` and instead
puts it into a heroku-prebuild hook. At the same time, env vars get
updated to use the `CMD` prefix. The configured buildpacks were not used.
Finally, npm run build is now automatically
done by Heroku.

Signed-off-by: Claudius <opensource@amenthes.de>

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