Fix links in README and add ropensci CoC #189

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gcc 14.2.0_1 is already installed and up-to-date. To reinstall 14.2.0_1, run: brew reinstall gcc

These files were overwritten during the `brew link` step:

pkgconf 2.3.0_1 is already installed and up-to-date. To reinstall 2.3.0_1, run: brew reinstall pkgconf

HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK is set: not checking for outdated dependents or dependents with broken linkage!