feat: update script for smoother setup (#3230)

Many users do not seem to read the docs. So, make the install script
handle most of the things that we include in the docs quickstart.

Ensures that the install script still functions as expected in
non-interactive environments - setup scripts, ci, etc. Offers a flag
just in case this check fails, to force non-interactive setup.

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## Checks
- [ ] I am happy for maintainers to push small adjustments to this PR,
to speed up the review cycle
- [ ] I have checked that there are no existing pull requests for the
same thing

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Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>

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