Release v3.0.0

What's new?

CI: add ci for go testing of cli (#73, @marmiha)
Cluster configuration and validation in Go (previously in Ansible) (#66, #74, @marmiha)
Rename cli package to make a valid import path (#75, @marmiha)
Cluster configuration defaults (#78, @MusicDin)
Local clusters can now be created in any directory, even if the directory is not a Kubitect project (#79, #105, @MusicDin)
Merge purge and destroy commands (#82, @MusicDin)
Kubespray is now bound to the Kubitect version (#84, @MusicDin)
Remove support for kubedns (#86, @MusicDin)
Export configuration presets with cli tool (#101, #113, @MusicDin)
Embed Ansible and Terraform source code into Go binary (#102, @MusicDin)

Fix Terraform error when VM's IP can't be read (#39, @seumasdunlop)
Remove experimental Terraform features (#67, @MusicDin)
Reformat go code and add readme for cli (#85, @marmiha)
Fix documentation URL in README (#88, @MusicDin)
Fix Terraform errors not being displayed if plan phase fails (#95, @MusicDin)
Fix unsupported CoreDNS version for Kubernetes versions 1.23 and 1.24 (#94, @MusicDin)
Allow tilde in filepaths (#98, @MusicDin)
Improve log verbosity in debug mode (#99, @MusicDin)
Scaling:
- Fix Kubespray setup before cluster scaling (#92, @MusicDin)
- Fix incorrect hosts inventory generation after cluster scaling (#96, #109, @MusicDin)
- Allow addition and deletion of hosts when cluster is scaled (#97, @MusicDin)
- Ensure there is no orphan resources when host is removed (#106, @MusicDin)