Update README: Governance, Adopters and more links (#4836)

* Update README: Governance, Adopters and more links

* Apply suggestions from code review

Co-authored-by: Daniel Beck <1831569+daniel-beck@users.noreply.github.com>

* Update README.md

Co-authored-by: Tim Jacomb <timjacomb1+github@gmail.com>

Co-authored-by: Daniel Beck <1831569+daniel-beck@users.noreply.github.com>
Co-authored-by: Tim Jacomb <timjacomb1+github@gmail.com>