Rename proboctl CLI binary to prb

Shorter CLI name for faster typing. Renames the binary, build targets,
goreleaser config, command examples, and documentation.

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

pkg/cmd/auth/logout/logout.go

@@ -31,10 +31,10 @@ func NewCmdLogout(f *cmdutil.Factory) *cobra.Command {
 		Use:   "logout",
 		Short: "Log out of a Probo host",
 		Example: `  # Log out of the active host
-  proboctl auth logout
+  prb auth logout
 
   # Log out of a specific host
-  proboctl auth logout --hostname app.getprobo.com`,
+  prb auth logout --hostname app.getprobo.com`,
 		RunE: func(cmd *cobra.Command, args []string) error {
 			cfg, err := f.Config()
 			if err != nil {