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Changes are: - Remove unix- and stm32-specific sections (move unix to its own README.md), stm32 was duplicated. - Add links to GitHub Discussions and Discord. - Update information about the project. - Add a getting started section. - Explain `make submodules`. Signed-off-by: Jim Mussared <jim.mussared@gmail.com> Signed-off-by: Damien George <damien@micropython.org>