feat: add configuration file handling

- add helper function to parse configuration from a YAML file
- update command-line parameters to include a config file option
- remove hardcoded Pomodoro settings and use parsed config instead
- delete obsolete PomodoroSettings.go file

🤖

internal/helper/config.go

@@ -0,0 +1,26 @@
+package helper
+
+import (
+	"ChronoTomato/pkg/models"
+	"github.com/charmbracelet/log"
+	"gopkg.in/yaml.v2"
+	"os"
+)
+
+func ParseConfig(filename string) models.ConfigFile {
+	var config models.ConfigFile
+	yamlFile, err := os.ReadFile(filename)
+	if err != nil {
+		log.Error("Error opening config file!", "reason", err)
+		log.Info("Using defaults")
+		return models.ConfigFile{
+			URL: "ws://localhost:8080/ws",
+		}
+	}
+	err = yaml.Unmarshal(yamlFile, &config)
+	if err != nil {
+		log.Fatalf("Unmarshal: %v", err)
+	}
+	return config
+
+}