Add `outputs` to all examples (#3830)
As of 1.7, you're required to specify your outputs.
The docs weren't caught up yet, though, leaving a lot of the old
implicit cache behavior.
In the interest of always educating with "the happy path", I've added
output arrays to our examples with various combinations of `.next/**`,
`.svelte-kit`, and `dist/**`.
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Co-authored-by: Nathan Hammond <nathan.hammond@vercel.com>
