Audit and align governance, contribution, and security docs with CNCF guidelines

TAG Security has prepared Security Guidelines for new projects on contribute.cncf.io that are worth reviewing to refresh and refamiliarize your project’s configuration and settings. There are also a variety of templates available to assist projects in bootstrapping any governance structure or process they may currently be missing. As your project grows, we encourage projects to leverage the TAG Contributor Strategy’s contributor ladder framework to create structure, expectations, and clear roles and responsibilities for welcoming and inviting contributors to take on more leadership roles within a project. Migrating to this framework can support projects and proactively manage contributions without creating or embellishing a sense of urgency.