docs: remove config section in favor of wiki, add links to wiki

cmd/cameradar/main.go

@@ -42,6 +42,7 @@ var flags = cmd.Flags{
 		Usage:    "The targets on which to scan for open RTSP streams in a network range format",
 		Aliases:  []string{"t"},
 		Sources:  cli.EnvVars(strcase.ToSNAKE(flagTargets)),
+		Required: true,
 	},
 	&cli.StringSliceFlag{
 		Name:    flagPorts,
@@ -127,13 +128,19 @@ func realMain() (code int) {
 		}
 	}()
 
-	app := &cli.Command{
+	scanCommand := &cli.Command{
-		Name:    "Cameradar",
+		Name:   "scan",
-		Version: version,
 		Usage:  "Scan targets for RTSP streams",
 		Flags:  flags,
 		Action: runCameradar,
+	}
+
+	app := &cli.Command{
+		Name:           "Cameradar",
+		Version:        version,
+		DefaultCommand: scanCommand.Name,
 		Commands: []*cli.Command{
+			scanCommand,
 			{
 				Name:   "version",
 				Usage:  "Print version information",