Rewrite terminal version of `nf-core launch`

[ewels]

Description of feature

The CLI / terminal version of nf-core launch has always been pretty clunky. I don't think many people use it, majority opting to use the web version for obvious reasons.

We will rewrite the web-based nf-core launch to take it out of the actual online website (see #2463) and this would be a good time to also rewrite the terminal version.

Instead of using a series of Questionary prompts, we should build this using Textual.