feat(config): Rename config file name to cosmicJars.yml

This change updates the file name to 'cosmicJars.yml'. Refactored the
config file handling and added logging.

src/main/java/com/georgev22/cosmicjars/CosmicJars.java

@@ -97,7 +97,7 @@ public CosmicJars(String[] args) {
                 """);
         logger.info("Made with love by George V. https://github.com/GeorgeV220");
 
-        configFile = new File(WORKING_DIRECTORY, "centroJars.yml");
+        configFile = new File(WORKING_DIRECTORY, "cosmicJars.yml");
         if (!configFile.exists()) {
             this.fileConfiguration = promptUserForServerDetails();
         } else {
@@ -267,7 +267,7 @@ public void saveConfig() {
         try {
             this.fileConfiguration.save(this.configFile);
         } catch (IOException e) {
-            this.logger.error("Error saving centroJars.yml: {}", e.getMessage());
+            this.logger.error("Error saving cosmicJars.yml: {}", e.getMessage());
         }
     }
 
@@ -342,4 +342,4 @@ public void sendCommand(String[] command) {
             default -> this.logger.info("Unknown command: {}, type 'help' for help", String.join(" ", command));
         }
     }
-}
+}