feat: update module path

- modify go.mod to reflect the new module path
- update config file path in the main function
- adjust import statements in various internal packages
- add install instructions to README

🤖

README.md

@@ -2,6 +2,10 @@
 
 A GoTomato command line client written in Go
 
+## Installation
+
+`go install git.smsvc.net/pomodoro/ChronoTomato@latest`
+
 ## Configuration
 
 `ChronoTomato` can be configured via CLI parameters or a config file.