Rename complete -> device-dashboard, remove multiple-logins and dashboard

examples/device-dashboard/main.c

@@ -0,0 +1,13 @@
+// Copyright (c) 2020-2022 Cesanta Software Limited
+// All rights reserved
+
+#include "mongoose.h"
+
+extern void run_web_server(struct mg_mgr *);
+
+int main(void) {
+  struct mg_mgr mgr;
+  mg_mgr_init(&mgr);
+  run_web_server(&mgr);
+  return 0;
+}