This moves the various projects from "type-based" folders (such as
"services" or "tools") into more appropriate semantic folders (such as
"nix", "ops" or "web").
Deprecated projects (nixcon-demo & gotest) which only existed for
testing/demonstration purposes have been removed.
(Note: *all* builds are broken with this commit)
Instead of having a manually prepared secret, use Cloud KMS (as per
the previous commits) to decrypt the in-repo secrets and template them
into the Secret resource in Kubernetes.
Not all of the values are actually secret, it has thus become a bit
easier to edit the known hosts, SSH config and such now.