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update README: Poetry no longer needed for users

The README still says

For now, you'll also need Poetry to run this software.

Since !10 (merged) and tag 0.1.0, this is no longer true: See here & db/dbs1/dbs1-gpws!3 for how it can be installed with pip.

update installation instructions to use pipx (or venv + pip)
update usage instructions to assume installed PyPI package, rather than using poetry in a repo clone.

Admin message

update README: Poetry no longer needed for users