cabal init not interactive by default in 3.0
Since `cabal init` is no longer interactive by default (as per my version, 126.96.36.199), including other minor changes to the `init` process, change the `cabal init` section to mention the usage of the `--interactive` flag, and the new minor changes (which/the order questions are asked, what the terminal output is). I came across this problem while learning `cabal` (having recently migrated from `stack`) and reading this section of Cabal's quickstart guide. To be proactive, add TIP relatively-linking to the new getting started guide (https://cabal.readthedocs.io/en/latest/getting-started.html) in a TIP at the top of the page. Implemented because that is the best "entrypoint" to the docs, but many resources/searches still point the user to this page being modified.
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