Print description of logging behavior on spin up

[lann]

"How can I see logs?" is a recurring question in Discord. We should at least print a description of how to find logs on spin up, maybe something like:

Writing app output to <path>; pass --follow-all to see it here on the console.

Ref #928, #974 (comment)

[michelleN]

Now that we've made follow-all the default experience, can we close this issue or should more be done here?

[michelleN]

Feel free to re-open