Fix up packages notes

I think we should keep the note about packages automatically setting up
the daemons for you, as that isn't exactly obvious when going through
this the first time.

As for the note for users wanting to contribute to the repositories, I'd
like to keep it consistent with, say, the Hacking note on
/installation.md, which is green as well. Also it's kinda hard to see
that short paragraph when it's right before a big yellow box.

I also don't think we need a note about Alpine being the only official
repository. The fact that Alpine hosts are the only officially supported
host sort of implies that.

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