docs: various clean ups and improvements

lichess-org / mobile

Lichess mobile app v2

GNU General Public License v3.0

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Closed tom-anders closed 2 months ago

tom-anders commented 2 months ago

Move dev-setup related docs from README.md to setting_dev_env.md, some of this was duplicated between the two.
Add "Before submitting a Pull Request" to CONTRIBUTING.md
Add section about PlatformWidget to coding_style.md