Remove connection attempts field from Config

data/example.json

@@ -7,6 +7,5 @@
   "mqtt_port": 1883,
   "mqtt_topic": "",
   "device_id": "",
-  "sleep_time": 30,
-  "connection_attempts": 60
+  "sleep_time": 30
 }

include/config.h

@@ -12,8 +12,7 @@ typedef struct {
     const char *topic;
     const char *device_id;
     int mqtt_port;
-    long sleep_time;
-    int connection_attempts;
+    unsigned long sleep_time;
 } Config;
 
 void initialize_config(Config *config, JsonDocument json);

src/config.cpp

@@ -11,7 +11,6 @@ void initialize_config(Config *config, JsonDocument json) {
     config->device_id = strdup(json["device_id"]);
     config->mqtt_port = json["mqtt_port"];
     config->sleep_time = minutes_to_milliseconds(json["sleep_time"]);
-    config->connection_attempts = json["connection_attempts"];
 }
 
 bool load_config_file(const char *file_path, Config *config) {