Note about `watch --no-server` doesn't belong here for two reasons:

1. Currently the default invocation of `watch` command behaves exactly the same as `preview` did. Such note could be useful if some specific action would be required to achieve the same behaviour with `watch` in case it did something different from the previous `preview` command.
2. It suggests using command which does completely different thing than `preview` did.

I think this should belong in the help section of `watch` instead.

Also both `preview` and `watch` should work with `preview` throwing a warning before running the `watch` command IMO.