CloudSecDocs: Notes/how-tos/cheatsheets related to cloud-native technologies

The git repo referenced in the header is 404: https://github.com/marco-lancini/cloudsecdocs/ which is relevant because there are some typos that could benefit from a PR or an issue, and separately a discussion about whether to rename "kubernetes master" to "kubernetes control-plane" (as I believe the upstream docs have removed that nomenclature from their docs)