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

🤖

pkg/models/configfile.go

@@ -0,0 +1,11 @@
+package models
+
+import (
+	"git.smsvc.net/pomodoro/GoTomato/pkg/models"
+)
+
+type ConfigFile struct {
+	URL            string                        `yaml:"url"`
+	Password       string                        `yaml:"password"`
+	PomodoroConfig models.GoTomatoPomodoroConfig `yaml:"config"`
+}