Halyard 0.28.0

feat(backup): Complete (KMS-less) backups (#551)
docs(readme): Demo gif (#552)
feat(cli): Make --deployment a global config flag (#549)
chore(install): Don't depend on $USER group to exist (#550)
chore(install): Forbid root from running Halyard (#548)
chore(bom): Add gitPrefix (#547)
chore(install): Halconfig should go in user's HOME, not root's (#546)
chore(install): Report IO error on first halconfig write (#545)
feat(s3): Adds --endpoint config (#544)
fix(validation): Static updates were reporting duplicate errors (#543)
chore(dependenices): Bump spinnaker dependencies to 93 (#541)
fix(validate/docker-registry): Fix OOB exception (#542)
fix(storage/s3): Don't validate/create S3 bucket twice (#540)
feat(bom): Add commit to artifact (#538)
chore(install): Simplify install script (#535)
docs(spacing): Fix spacing (#534)
docs(provider/google): Add clarifying text to --image-projects help text. (#532)
fix(deploy): Local debian binds to localhost by default (#533)
fix(deploy): Additional netflix-orca fixes (#531)
fix(deploy): Set default bake account in orca (#530)
feat(version): No default spinnaker version (#529)
fix(links): Switch off github domain (#528)
chore(docs): Cleanup doc formatting (#527)
fix(deploy): Multi vm keygen (#526)
fix(deploy): Create missing profile dirs when deploying debs (#524)
chore(docs): Separate params from subcommands in docs (#525)
93aa642 fix(ui): show changelog (#521)