Rename all ID fields to {resource_noun}_id instead of removing them
outright. This means people can still get at the info.
Leave project's id deleted. It has been marked as Removed for months.
I'm fine with cleaning it up before 1.0.0.
Also, update website docs.
* Used standard validation functions where possible, added a GCP name validation function.
* Add tests for GCP name, factor out a ValidateRegexp function.
* make fmt