doc: updating critical files

[joesepi]

• Updated CONTRIBUTING.md
• Updated SECURITY.md
• Removed MAINTAINERS.md in favor of CODEOWNERS
• Removed CHANGELOG.md

[lehors]

CODEOWNERS is not a replacement for MAINTAINERS.md. CODEOWNERS is completely opaque, especially when it refers to some team whose definition isn't publicly accessible. MAINTAINERS.md is about documenting transparently who has write access to the repo and should also document how the list of maintainers is managed (i.e., the requirements and process for one to become a maintainer and for one to be retired).

[joesepi]

CODEOWNERS is not a replacement for MAINTAINERS.md. CODEOWNERS is completely opaque, especially when it refers to some team whose definition isn't publicly accessible. MAINTAINERS.md is about documenting transparently who has write access to the repo and should also document how the list of maintainers is managed (i.e., the requirements and process for one to become a maintainer and for one to be retired).

@lehors - I didn't realize the teams are opaque. You are right. However, this maintainers file is a stub, so I created a new issue to add back a valid MAINTAINERS.md file and there is already an issue you created as well that is specific to the taxonomy repo:

• Update community MAINTAINER.md file for entire ORG taxonomy#90
• Update MAINTAINERS.md file for all repos #55

[lhawthorn]

LGTM.